OU Diancie

Gary

Can be abrasive at times (no joke)
is a Site Content Manager Alumnusis a Forum Moderator Alumnusis a Community Contributor Alumnusis a Tiering Contributor Alumnusis a Top Contributor Alumnus
I cucked Leo chofl

[OVERVIEW]

Mega Diancie's strong offensive capabilities and above average Speed stat make it a top-tier pick in the OU metagame. Its Rock / Fairy typing along with good coverage options in Earth Power, Psychic, and Nature Power make it very difficult to switch into reliably, allowing it to tear apart common defensive cores. Mega Diancie's Magic Bounce ability allows it to pressure common entry hazard setters such as Garchomp, Smeargle, and Clefable, as well as giving it an immunity to status moves. Mega Diancie also has access to Stealth Rock as well as setup options in Rock Polish and Calm Mind, making it quite versatile. Unfortunately, Mega Diancie's defensive stats are quite lackluster, leaving it very vulnerable to being revenge killed by common Choice Scarf users as well as faster Pokemon such as Greninja, Tapu Koko, and Mega Lopunny. This is made worse by Mega Diancie's common weaknesses to Ground-, Water-, Grass-, and Steel-type attacks. Mega Diancie is also very easily trapped by Dugtrio, limiting its effectiveness against stall as well as Mega Charizard Y teams.

[SET]
name: All-out Attacker
move 1: Moonblast
move 2: Diamond Storm
move 3: Hidden Power Fire
move 4: Nature Power / Earth Power / Stealth Rock
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Moonblast is Mega Diancie's strongest Fairy-type STAB move that hits Dragon-, Fighting-, and Dark-types, and it's just Diancie's hardest-hitting move in general with maximum Special Attack investment. Diamond Storm shreds Zapdos, Mega Pinsir, Mega Charizard Y, and Volcarona, as well as hitting the likes of Mega Venusaur and Amoonguss harder than anything else. Hidden Power Fire provides the most coverage for common Steel-types such as Ferrothorn and Mega Scizor, and it also dents Skarmory and non-Assault Vest Magearna. Nature Power in Electric Terrain becomes Thunderbolt, which blasts through Celesteela and Toxapex cores that normally give Mega Diancie trouble, and it provides all-around great coverage in general. Earth Power is the best option if you aren't using Tapu Koko as a teammate, because it hits Magearna and Mega Mawile harder than anything else while still nailing Toxapex and Magnezone and OHKOing Heatran. If you lack a Stealth Rock user, Mega Diancie is a good user of the move because it forces a lot of switches and can pressure common Defoggers such as Mew, Latios, Mantine, and Zapdos on stall. Mega Diancie also pressures Mega Sableye from switching in to bounce back Stealth Rock. Psychic is also an option because it hits Mega Venusaur very hard as well as Toxapex, but keep in mind that this would be best used on teams with Tapu Lele.

Set Details
========

Maximum Special Attack investment is best in this more physically bulky metagame, letting Mega Diancie hit Pokemon like Mew and Bold Clefable harder as well as powering up its other coverage moves. A Naive nature is preferred because Mega Diancie can somewhat take physical priority moves such as Fake Out, Sucker Punch, Ice Shard, Aerilate Quick Attack, and Extreme Speed. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams if you were unable to keep it off the field. Maximum Attack investment can be used to pressure Chansey more as well as to hit specially defensive Celesteela harder, but this makes Mega Diancie's other coverage moves and Moonblast significantly weaker, and it will miss out on OHKOing bulkier variants of Zygarde.

Usage Tips
========

Bring Mega Diancie in as much as possible to start punching holes into the opponent's team, as well as spamming Moonblast and Diamond Storm when appropriate. Going for Hidden Power Fire on a predicted Mega Scizor or Ferrothorn switch-in can be very beneficial, as it can help Mega Diancie retain a lot of momentum and force them to use Bullet Punch or switch out. This also goes for any of Mega Diancie's other coverage moves, because Mega Diancie should rarely ever stay in on something it can't OHKO due to its fragility. Avoid hard switching Mega Diancie into anything, and try to only bring it in on sacrifices, double switches, and free momentum; however, it can somewhat switch into weaker resisted attacks if absolutely necessary. Mega Evolving as soon as possible is very important because it allows Mega Diancie to be immune to status moves and pressure entry hazard setters like Smeargle, Chansey, and Mew.

Team Options
========

Tapu Koko is a great partner because Nature Power in Electric Terrain becomes Thunderbolt, which can make Mega Diancie very difficult to wall defensively. It also helps get Mega Diancie in for free with U-turn. Spikes support from the likes of Ferrothorn and both Greninja formes is really nice because it can help Mega Diancie pressure Pokemon such as Mew, Magearna, and Toxapex. Toxapex itself is a good teammate because it can set up Toxic Spikes, which are useful for wearing down switch-ins such as Assault Vest Tangrowth. Similarly, Assault Vest Tangrowth is a good partner because it can switch into Ash-Greninja as well as take hits from common revenge killers such as Choice Scarf Kartana, Keldeo, and Garchomp. Choice Scarf Tapu Lele protects Mega Diancie from priority from the likes of Mega Scizor and Ash-Greninja, and it also helps by revenge killing Greninja and Mega Lopunny. Dugtrio is a good partner because it can trap Assault Vest Magearna and Chansey, which are two of Mega Diancie's best switch-ins. Heatran can punish Mega Scizor, Ferrothorn, and Magearna, which Mega Diancie often baits in.

[SET]
name: Setup Sweeper
move 1: Rock Polish
move 2: Moonblast
move 3: Diamond Storm
move 4: Hidden Power Fire / Earth Power
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Rock Polish is best used late-game after bulkier threats such as Toxapex and Celesteela have been heavily weakened. After a boost, Mega Diancie can't be revenge killed by common Choice Scarf users such as Kartana or faster Pokemon such as Greninja and Tapu Koko. Calm Mind is an option over Rock Polish to better shred through bulkier cores, as Mega Diancie can set it up on the likes of Mew and Clefable. Moonblast is Mega Diancie's best special STAB move that destroys Tyranitar, Zygarde, and Keldeo. Diamond Storm is very strong and does more damage than unboosted Power Gem, making it superior on both Rock Polish and Calm Mind sets because of its overall higher damage output without needing to set up as well as its ability to pressure Pokemon such as Chansey and Celesteela. The potential +2 Defense boost can also be very helpful for setting up. Hidden Power Fire rounds off the set by hitting Mega Scizor, Ferrothorn, and most other Steel-types. Earth Power is an option for Toxapex as well as Magearna, and it's arguably the best option if using Calm Mind because of its better all-around coverage.

Set Details
========

Maximum Special Attack investment is best for powering up Mega Diancie's Moonblasts and coverage moves, while maximum Speed and a Naive nature are used to make Mega Diancie as fast as possible. A Rash nature can be used to heavily increase Mega Diancie's damage output in order for easier sweeps, but it significantly lessens Mega Diancie's usefulness earlier on in the match due to its lower Speed. Alternatively, a Naughty nature with maximum Attack investment can be used, but this suffers from the same issue. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams to still get to +2 Speed even if Sticky Web is up.

Usage Tips
========

Preserving Mega Diancie's HP for late-game is very important so it can potentially sweep. It is unwise to hard switch Mega Diancie into any attacks; instead, it's best to bring it in safely via momentum and double switching. Spamming Diamond Storm to try to get a Defense boost before pulling off a sweep if all possible can be very beneficial, because Mega Scizor can't revenge kill Mega Diancie at +2 Defense, for example. There's no point in going for Rock Polish if the opponent still has an Ash-Greninja or Mega Scizor in the back, because Mega Diancie will just get revenge killed. Only go for Rock Polish when you are confident Mega Diancie won't be forced out afterwards. Calm Mind makes Mega Diancie more of a breaker that helps it muscle through the likes of Clefable, Mew, Toxapex, and even Tangrowth, so it can be played a bit more aggressively than its other sets. The choice of when to Mega Evolve depends very much on the matchup itself. Sometimes Mega Diancie can take advantage of its bulk before Mega Evolving to set up on stronger attacks, such as Choice Scarf Latios's Psyshock or and Tapu Koko's Wild Charge. Most of the time, though, it's just best to Mega Evolve as soon as possible to exploit Mega Diancie's Speed and power throughout the entire match.

Team Options
========

Magnezone is worth using with this set despite the shared weakness to Dugtrio, because it can really help Rock Polish Mega Diancie pull off a sweep late-game by trapping Mega Scizor, Skarmory, and Celesteela. Tapu Lele is a very nice partner because it can protect Mega Diancie from priority moves from the likes of Ash-Greninja and Mega Scizor, allowing it to sweep late-game with Rock Polish in Psychic Terrain. Tapu Lele is also useful for its ability to wear down Steel-types and take advantage of Mega Venusaur and Toxapex. Spikes support from Ferrothorn and Greninja is great because it allows Mega Diancie to sweep much more comfortably late-game and keeps it from having to set up more than one Calm Mind. Tapu Koko can give Mega Diancie much-needed momentum while weakening the likes of Assault Vest Magearna and Chansey and pressuring Steel-types. Ash-Greninja can heavily weaken down defensive cores and appreciates the likes of Toxapex, Celesteela, and Magearna weakened, as well as Mega Diancie's ability to deter entry hazards. Heatran is a useful partner for its ability to switch into Grass-type moves and force out Steel-types. Swords Dance Landorus-T is useful versus stall, which Rock Polish Diancie has a very hard time really doing that much against. Lures for Mega Scizor and Celesteela are always nice, so something like Hidden Power Fire or Electrium Z Latios as well as Rockium Z Tapu Bulu can work.

[STRATEGY COMMENTS]
Other Options
=============

A set consisting of Substitute / Endeavor / Moonblast / Diamond Storm with maximum Attack investment can be effective, albeit niche, because it allows Mega Diancie to destroy a lot of bulky Pokemon such as Chansey, Celesteela, and Mew due to its low HP stat. Endeavor can put these Pokemon in range of Diamond Storm if Mega Diancie is at a low enough amount of HP. Power Gem is decently strong and can work well with Calm Mind, but Diamond Storm is better in almost every way, especially when you factor in its high Defense-boosting probability. Magnet Rise can shut down bulky Landorus-T because it can't really touch Mega Diancie, although offensive variants will still have a way around it. Magnet Rise can also be nice for Heatran, Garchomp, Mega Pinsir, and Dugtrio so it can't trap Mega Diancie the following turn. Hidden Power Ice can OHKO bulky Landorus-T after Stealth Rock, but it's not really worth missing out on the extra coverage Hidden Power Fire brings. Sharpen with maximum Attack investment can help Mega Diancie muscle through Chansey and Mega Venusaur, but not much else. Heal Bell can be nice on teams that are very weak to Toxic Spikes that don't run a hazard remover, and it's also just nice in general because it lets you play more aggressively with your Pokemon.

Checks and Counters
===================

**Chansey**: Chansey can tank basically anything Mega Diancie throws at it, even Diamond Storm. It only really dislikes maximum Attack variants because of their stronger Diamond Storms, but even then, Chansey can just stall them out with Soft-Boiled.

**Steel-types**: Mega Scizor is one of the best checks to Mega Diancie in the tier because of Technician-boosted Bullet Punch, and it can also switch into any move of Mega Diancie's except Hidden Power Fire. Assault Vest Magearna and specially defensive Jirachi can switch into basically any attack, even Earth Power, although not repeatedly. Celesteela is a pretty risk-free switch-in to Mega Diancie as well, and it only really fears Nature Power in Electric Terrain. Specially defensive Skarmory can avoid the 2HKO from Hidden Power Fire and only fears Nature Power as well. Ferrothorn has to watch out for Hidden Power Fire, but it can easily take one and retaliate back with a Gyro Ball or Power Whip.

**Bulky Water-types**: Gastrodon avoids the 2HKO from Moonblast and takes very little from any other move, making it a very effective counter. Toxapex avoids the 2HKO from Diamond Storm very easily and can even avoid being 2HKOed by Earth Power. It only has to watch out for Nature Power in Electric Terrain. Suicune can avoid the 2HKO from Mega Diancie's STAB moves and retaliate with a Scald. Protect can also help stalling out Electric Terrain.

**Bulky Grass-types**: Mega Venusaur can wall Mega Diancie pretty comfortably, especially when it's invested in physical bulk, and threatens it with Giga Drain, fearing only the rare Psychic. Amoonguss can do much of the same but has to be more wary of Diamond Storm, especially from maximum Attack variants. Assault Vest Tangrowth can avoid the 2HKO from both STAB moves, and it fears very little from Mega Diancie's coverage moves.

**Faster Revenge Killers**: Choice Scarf users such as Keldeo, Garchomp, and Kartana, as well as faster threats such as both Greninja formes, Tapu Koko, Mega Lopunny, and Mega Alakazam, can outspeed and revenge kill Mega Diancie. Kingdra and Mega Swampert can also outspeed Mega Diancie in the rain, and Ash-Greninja can OHKO it with Water Shuriken. Dugtrio traps Mega Diancie and OHKOes it with Earthquake.
 
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p2

Banned deucer.
mention +spa nature in rock polish set details imo its strong as fuck along with physically biased evs there too and +atk nature

1/3
 
In "Checks and Counters" section, I would add the fact that Scarf Kartana can OHKO Mega Diancie even at +2 Defense with Smart Strike, just Ferrothorn's Gyro Ball and Celesteela's Heavy Slam:

252 Atk Kartana Smart Strike vs. +2 0 HP / 0 Def Diancie-Mega: 268-324 (111.2 - 134.4%) -- guaranteed OHKO

0 Atk Ferrothorn Gyro Ball (150 BP) vs. +2 0 HP / 0 Def Diancie-Mega: 288-340 (119.5 - 141%) -- guaranteed OHKO

0 Atk Celesteela Heavy Slam (120 BP) vs. +2 0 HP / 0 Def Diancie-Mega: 240-288 (99.5 - 119.5%) -- 93.8% chance to OHKO (if you want the 100% chance, 4 EV in Atk achieve this)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Life Orb Weavile's Iron Tail can do this too, but I don't think this is that relevant:

252 Atk Life Orb Weavile Iron Tail vs. +2 0 HP / 0 Def Diancie-Mega: 250-296 (103.7 - 122.8%) -- guaranteed OHKO
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Also, Scarf Keldeo's Scald can OHKO Mega Diancie, no matter what Nature it runs:

252 SpA Keldeo Scald vs. 0 HP / 0 SpD Diancie-Mega: 240-284 (99.5 - 117.8%) -- 93.8% chance to OHKO
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Tapu Lele also can revenge kill it after Rocks with Pyshic

252 SpA Tapu Lele Psychic vs. 0 HP / 0 SpD Diancie-Mega in Psychic Terrain: 205-243 (85 - 100.8%) -- 81.3% chance to OHKO after Stealth Rock
 

Gary

Can be abrasive at times (no joke)
is a Site Content Manager Alumnusis a Forum Moderator Alumnusis a Community Contributor Alumnusis a Tiering Contributor Alumnusis a Top Contributor Alumnus
I'll attempt to harness enough autism to write this up by the end of tomorrow. No promises though.

EDIT: This is written.
 
Last edited:

P Squared

a great unrecorded history
is a Site Content Manageris a Community Contributoris a Top Contributoris a Top Social Media Contributor Alumnusis a Senior Staff Member Alumnusis a Top Smogon Media Contributor Alumnus
GP 1/2

[OVERVIEW]

Mega Diancie's strong offensive capabilities and above average Speed stat make it a top-tier pick in the OU metagame. Its Rock / Fairy typing Rock- and Fairy-typing along with good coverage options in Earth Power, Psychic, and Nature Power make it very difficult to switch into reliably, allowing it to tear apart common defensive cores. Mega Diancie's Magic Bounce ability allows it to pressure common entry hazard setters such as Garchomp, Smeargle, and Clefable, as well as give it an immunity to status moves. Mega Diancie also has access to Stealth Rock, as well as setup options in Rock Polish and Calm Mind, making it quite versatile. Unfortunately, Mega Diancie's defensive stats are quite lackluster, leaving it very vulnerable to being revenge killed by common Choice Scarf users as well as faster Pokemon such as Greninja, Tapu Koko, and Mega Lopunny. This is made worse by Mega Diancie's common weaknesses to Ground-, Water-, Grass-, and Steel-type attacks. Mega Diancie is also very easily trapped by Dugtrio, limiting its effectiveness against stall as well as Mega Charizard Y teams.

[SET]
name: All-out Attacker
move 1: Moonblast
move 2: Diamond Storm
move 3: Hidden Power Fire
move 4: Nature Power / Earth Power / Stealth Rock
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Moonblast is Mega Diancie's strongest Fairy-type STAB move that hits Dragon-, Fighting-, and Dark-types, and it's is just Diancie's hardest-hitting move in general with maximum Special Attack investment. Diamond Storm shreds Zapdos, Mega Pinsir, Mega Charizard Y, and Volcarona, as well as hitting the likes of Mega Venusaur and Amoonguss harder than anything else. Hidden Power Fire provides the most amount of coverage for common Steel-types such as Ferrothorn and Mega Scizor, and it also dents as well as denting Skarmory and non-Assault Vest Magearna. Nature Power in Electric Terrain becomes Thunderbolt, which blasts through Celesteela and Toxapex cores that which normally give Mega Diancie trouble, and it provides as well just being all-around great coverage in general. Earth Power is the best option if you aren't using Tapu Koko as a teammate, because it hits Magearna and Mega Mawile harder than anything else while as well as still nailing Toxapex, Magnezone, and OHKOing Heatran. If you lack a Stealth Rock user, Mega Diancie is a good user of the move because it forces a lot of switches and can pressure common Defoggers such as Mew, Latios, Mantine, and Zapdos on stall. Mega Diancie also pressures Mega Sableye from bouncing back Stealth Rock. Psychic is also an option because it hits Mega Venusaur very hard as well as Toxapex, but keep in mind that this would be best used with Tapu Lele.

Set Details
========

Maximum Special Attack investment is best in this more physically bulky metagame, letting Mega Diancie hit because it is more physically bulky, so hitting Pokemon like Mew and Bold Clefable harder is really nice, as well as powering up its Mega Diancie's other coverage moves. A Naive nature is preferred because Mega Diancie can somewhat take physical priority moves such as Fake Out, Sucker Punch, Ice Shard, Aerilate Quick Attack, and Extreme Speed. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams if you were unable to keep it off the field. Maximum Attack investment (is this instead of Special Attack?) can be used to pressure Chansey more as well as to hit specially defensive Celesteela harder, but this makes Mega Diancie's other coverage moves and Moonblast significantly weaker, and it will miss out on OHKOing bulkier variants of Zygarde.

Usage Tips
========

Bring Mega Diancie in as much as possible to start punching holes into the opponent's team, as well as spamming Moonblast and Diamond Storm when appropriate. Going for Hidden Power Fire on a predicted Mega Scizor or Ferrothorn switch-in can be very beneficial, as it can help Mega Diancie retain a lot of momentum and force them to use Bullet Punch or switch out. This also goes for any of Mega Diancie's other coverage moves, because Mega Diancie should rarely ever stay in on something it can't OHKO due to its fragility. Avoid hard switching Mega Diancie into anything and try to only bring it in on sacrifices sacks, double switches, and free momentum; however, it can somewhat switch into weaker resisted attacks if absolutely necessary. Mega Evolving as soon as possible is very important because it allows Mega Diancie to be immune to status moves, (RC) and pressure entry hazard setters like Smeargle, Chansey, and Mew.

Team Options
========

Tapu Koko is a great partner for obvious reasons because Nature Power in Electric Terrain becomes Thunderbolt, which can make Mega Diancie very difficult to wall defensively. It also helps get Mega Diancie in for free with U-turn. Spikes support from the likes of Ferrothorn and both Greninja formes is are really nice because it can help Mega Diancie pressure Pokemon such as Mew, Magearna, and Toxapex. Toxapex itself is a good teammate because it can set up Toxic Spikes, which are useful for wearing down switch-ins such as Assault Vest Tangrowth. Similarly, Assault Vest Tangrowth is a good partner because it can switch into Ash-Greninja as well as take hits from common revenge killers such as Choice Scarf Kartana, Keldeo, and Garchomp. Choice Scarf Tapu Lele protects Mega Diancie from priority from the likes of Mega Scizor and Ash-Greninja, and it also helps by as well as revenge killing Greninja and Mega Lopunny. Dugtrio is a good partner because it can trap Assault Vest Magearna and Chansey, which are two of Mega Diancie's best switch-ins. Heatran can punish Mega Scizor, Ferrothorn, and Magearna, which Mega Diancie often baits in.

[SET]
name: Setup Sweeper
move 1: Rock Polish
move 2: Moonblast
move 3: Diamond Storm
move 4: Hidden Power Fire / Earth Power
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Rock Polish is best used late-game after bulkier threats such as Toxapex and Celesteela have been heavily weakened. After a boost, Mega Diancie can't be revenge killed by common Choice Scarf users such as Kartana or faster Pokemon such as Greninja and Tapu Koko. Calm Mind is an option over Rock Polish to better shred through bulkier cores, as Mega Diancie it can set it up on the likes of Mew and Clefable. Moonblast is Mega Diancie's best special STAB move that destroys Tyranitar, Zygarde, and Keldeo. Diamond Storm is very strong, (RC) and does more damage initially than unboosted Power Gem before a Calm Mind boost, making it superior on both Rock Polish and Calm Mind sets because of its overall higher damage output without needing to set up, as well as its ability to pressure pressuring Pokemon such as Chansey and Celesteela. Diamond Storm's potential +2 Defense boost can also be very helpful for setting up. Hidden Power Fire rounds off the set by hitting Mega Scizor, Ferrothorn, and most other Steel-types. Earth Power is an option for Toxapex as well as Magearna, and it's arguably the best option if using Calm Mind because of its better all-around coverage.

Set Details
========

Maximum Special Attack investment is best for powering up Mega Diancie's Moonblasts and coverage moves, while maximum Speed and a Naive nature are used to make Mega Diancie as fast as possible. A Rash nature can be used to heavily increase Mega Diancie's damage output in order for easier sweeps, but it significantly lessens Mega Diancie's usefulness earlier on in the match due to its lower Speed. Alternatively, a Naughty nature with maximum Attack investment can be used, but this suffers from the same issue. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams to still get to +2 Speed even if Sticky Web is up.

Usage Tips
========

The Rock Polish set functions very similarly to the All-Out Attacker set early-game, but (don't make them read the other set, copy paste if you must) perpreserving Mega Diancie's HP for late-game is very important so it can potentially sweep. It is still unwise to hard switch Mega Diancie into any attacks, and; instead, it's best to bring it in safely via momentum and double switching. Spamming Diamond Storm to try to and get a Defense boost before pulling off a sweep if all possible can be very beneficial, because Mega Scizor can't revenge kill Mega Diancie at +2 Defense, for example. There's no point in going for Rock Polish if the opponent still has an Ash-Greninja or Mega Scizor in the back, because Mega Diancie will just get revenge killed. Only go for Rock Polish when you are confident Mega Diancie won't be forced out afterwards. Calm Mind makes Mega Diancie more of a breaker that helps it muscle through the likes of Clefable, Mew, Toxapex, and even Tangrowth, so it can be played a bit more aggressively than its other sets. The choice of when to Mega Evolve depends very much on the matchup itself. Sometimes Mega Diancie can take advantage of abuse its bulk in its regular forme to set up on stronger attacks, such as Choice Scarf Latios's Psyshock or Tapu Koko's Wild Charge. Most of the time, it's just best to Mega Evolve as soon as possible to exploit abuse Mega Diancie's Speed and power throughout the entire match.

Team Options
========

Magnezone is more worth using with this set despite their common weakness to Dugtrio, because it can really help Rock Polish Mega Diancie pull off a sweep late-game by trapping Mega Scizor, Skarmory, and Celesteela. Tapu Lele is a very nice partner because it can protect Mega Diancie from priority moves from the likes of Ash-Greninja and Mega Scizor, allowing it to sweep late-game with Rock Polish in Psychic Terrain. Tapu Lele is also useful for its ability to wear down Steel-types and take advantage of Mega Venusaur and Toxapex. Spikes support from Ferrothorn and Greninja is are great because it allows Mega Diancie to sweep much more comfortably late-game, (RC) and keeps it from having to set up more than one Calm Mind. Tapu Koko can give Mega Diancie much-needed momentum while weakening the likes of Assault Vest Magearna, (RC) and Chansey, (RC) and pressuring Steel-types. Ash-Greninja can heavily weaken down defensive cores and appreciates the likes of Toxapex, Celesteela, and Magearna weakened, as well as Mega Diancie's ability to deter entry hazards. Heatran is once again a useful partner for its ability to switch into Grass-type moves and force out Steel-types. Swords Dance Landorus-T is useful versus stall, which Rock Polish Diancie has a very hard time really doing that much against. Lures for Mega Scizor and Celesteela are always nice, so something like Hidden Power Fire or Electrium Z Latios as well as Rockium Z Tapu Bulu can work.

[STRATEGY COMMENTS]
Other Options
=============

A set consisting of Substitute / Endeavor / Moonblast / Diamond Storm with maximum Attack investment can be effective, albeit niche, because it allows Mega Diancie to destroy a lot of bulky Pokemon such as Chansey, Celesteela, and Mew, (RC) due to its low HP stat. Endeavor can put these Pokemon in range of Diamond Storm if Mega Diancie is it's at a low enough amount of HP. Power Gem is decently strong and can work well with Calm Mind, but Diamond Storm is better in almost every way, especially when you factor in its high Defense-boosting probability. Magnet Rise can troll shut down (sorry lol) bulky Landorus-T because it can't really touch Mega Diancie, although offensive variants will still have a way around it. Magnet Rise can also be nice for Heatran, Garchomp, Mega Pinsir, and Dugtrio so it can't trap Mega Diancie the following turn. Hidden Power Ice can OHKO bulky Landorus-T after Stealth Rock, but it's not really worth missing out on the extra coverage Hidden Power Fire brings. Sharpen with maximum Attack investment can help Mega Diancie muscle through Chansey and Mega Venusaur, but not much else. Heal Bell can be nice on teams that are very weak to Toxic Spikes that don't run a hazard remover, and it's also just nice in general because it lets you play more aggressively with your Pokemon.

Checks and Counters
===================

**Chansey**: Chansey can tank basically anything Mega Diancie throws at it, even Diamond Storm. It only really dislikes maximum Attack variants because of their stronger Diamond Storms, but even then, Chansey can just stall it out with Soft-Boiled.

**Steel-types**: Mega Scizor is one of the best checks to Mega Diancie in the tier because of Technician-boosted Bullet Punch, and it can also while being able to switch into any move of Mega Diancie's except Hidden Power Fire. Assault Vest Magearna and specially defensive Jirachi can switch into basically any attack, even Earth Power, although not repeatedly continuously. Celesteela is a pretty risk-free switch-in to Mega Diancie as well, and it only really fears Nature Power in Electric Terrain. Specially defensive Skarmory can avoid the 2HKO from Hidden Power Fire and only fears Nature Power as well. Ferrothorn has to watch out for Hidden Power Fire, but it can easily take one and retaliate back with a Gyro Ball or Power Whip.

**Bulky Water-types**: Gastrodon avoids the 2HKO from Moonblast and takes very little from any other move, making it a very effective counter. Toxapex avoids the 2HKO from Diamond Storm very easily and can even avoid being 2HKOed by Earth Power. It only has to watch out for Nature Power in Electric Terrain. Suicune can avoid the 2HKO from Mega Diancie's its STAB moves and retaliate with a Scald. Protect can also help stalling out Electric Terrain.

**Bulky Grass-types**: Mega Venusaur can wall Mega Diancie pretty comfortably, especially when it's invested in physical defense, and threatens it with Giga Drain, fearing only the rare Psychic. Amoonguss can do much of the same, (RC) but has to be more wary of Diamond Storm, especially from maximum Attack variants. Assault Vest Tangrowth can avoid the 2HKO from both STAB moves, and it fears very little from Mega Diancie's coverage moves.

**Faster Revenge Killers**: Choice Scarfer users such as Keldeo, Garchomp, and Kartana, as well as faster threats such as both Greninja formes, Tapu Koko, Mega Lopunny, and Mega Alakazam, can outspeed and revenge kill Mega Diancie. Kingdra and Mega Swampert can also outspeed Mega Diancie in the rain, and Ash-Greninja can OHKO it with Water Shuriken (Greninja was mentioned in the previous sentence, is this different?). Dugtrio traps Mega Diancie and OHKOes it with Earthquake.
 
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Gary

Can be abrasive at times (no joke)
is a Site Content Manager Alumnusis a Forum Moderator Alumnusis a Community Contributor Alumnusis a Tiering Contributor Alumnusis a Top Contributor Alumnus
GP 1/2

[OVERVIEW]

Mega Diancie's strong offensive capabilities and above average Speed stat make it a top-tier pick in the OU metagame. Its Rock / Fairy typing Rock- and Fairy-typing along with good coverage options in Earth Power, Psychic, and Nature Power make it very difficult to switch into reliably, allowing it to tear apart common defensive cores. Mega Diancie's Magic Bounce ability allows it to pressure common entry hazard setters such as Garchomp, Smeargle, and Clefable, as well as give it an immunity to status moves. Mega Diancie also has access to Stealth Rock, as well as setup options in Rock Polish and Calm Mind, making it quite versatile. Unfortunately, Mega Diancie's defensive stats are quite lackluster, leaving it very vulnerable to being revenge killed by common Choice Scarf users as well as faster Pokemon such as Greninja, Tapu Koko, and Mega Lopunny. This is made worse by Mega Diancie's common weaknesses to Ground-, Water-, Grass-, and Steel-type attacks. Mega Diancie is also very easily trapped by Dugtrio, limiting its effectiveness against stall as well as Mega Charizard Y teams.

[SET]
name: All-out Attacker
move 1: Moonblast
move 2: Diamond Storm
move 3: Hidden Power Fire
move 4: Nature Power / Earth Power / Stealth Rock
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Moonblast is Mega Diancie's strongest Fairy-type STAB move that hits Dragon-, Fighting-, and Dark-types, and it's is just Diancie's hardest-hitting move in general with maximum Special Attack investment. Diamond Storm shreds Zapdos, Mega Pinsir, Mega Charizard Y, and Volcarona, as well as hitting the likes of Mega Venusaur and Amoonguss harder than anything else. Hidden Power Fire provides the most amount of coverage for common Steel-types such as Ferrothorn and Mega Scizor, and it also dents as well as denting Skarmory and non-Assault Vest Magearna. Nature Power in Electric Terrain becomes Thunderbolt, which blasts through Celesteela and Toxapex cores that which normally give Mega Diancie trouble, and it provides as well just being all-around great coverage in general. Earth Power is the best option if you aren't using Tapu Koko as a teammate, because it hits Magearna and Mega Mawile harder than anything else while as well as still nailing Toxapex, Magnezone, and OHKOing Heatran. If you lack a Stealth Rock user, Mega Diancie is a good user of the move because it forces a lot of switches and can pressure common Defoggers such as Mew, Latios, Mantine, and Zapdos on stall. Mega Diancie also pressures Mega Sableye from bouncing back Stealth Rock. Psychic is also an option because it hits Mega Venusaur very hard as well as Toxapex, but keep in mind that this would be best used with Tapu Lele.

Set Details
========

Maximum Special Attack investment is best in this more physically bulky metagame, letting Mega Diancie hit because it is more physically bulky, so hitting Pokemon like Mew and Bold Clefable harder is really nice, as well as powering up its Mega Diancie's other coverage moves. A Naive nature is preferred because Mega Diancie can somewhat take physical priority moves such as Fake Out, Sucker Punch, Ice Shard, Aerilate Quick Attack, and Extreme Speed. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams if you were unable to keep it off the field. Maximum Attack investment (is this instead of Special Attack?) can be used to pressure Chansey more as well as to hit specially defensive Celesteela harder, but this makes Mega Diancie's other coverage moves and Moonblast significantly weaker, and it will miss out on OHKOing bulkier variants of Zygarde.

Usage Tips
========

Bring Mega Diancie in as much as possible to start punching holes into the opponent's team, as well as spamming Moonblast and Diamond Storm when appropriate. Going for Hidden Power Fire on a predicted Mega Scizor or Ferrothorn switch-in can be very beneficial, as it can help Mega Diancie retain a lot of momentum and force them to use Bullet Punch or switch out. This also goes for any of Mega Diancie's other coverage moves, because Mega Diancie should rarely ever stay in on something it can't OHKO due to its fragility. Avoid hard switching Mega Diancie into anything and try to only bring it in on sacrifices sacks, double switches, and free momentum; however, it can somewhat switch into weaker resisted attacks if absolutely necessary. Mega Evolving as soon as possible is very important because it allows Mega Diancie to be immune to status moves, (RC) and pressure entry hazard setters like Smeargle, Chansey, and Mew.

Team Options
========

Tapu Koko is a great partner for obvious reasons because Nature Power in Electric Terrain becomes Thunderbolt, which can make Mega Diancie very difficult to wall defensively. It also helps get Mega Diancie in for free with U-turn. Spikes support from the likes of Ferrothorn and both Greninja formes is are really nice because it can help Mega Diancie pressure Pokemon such as Mew, Magearna, and Toxapex. Toxapex itself is a good teammate because it can set up Toxic Spikes, which are useful for wearing down switch-ins such as Assault Vest Tangrowth. Similarly, Assault Vest Tangrowth is a good partner because it can switch into Ash-Greninja as well as take hits from common revenge killers such as Choice Scarf Kartana, Keldeo, and Garchomp. Choice Scarf Tapu Lele protects Mega Diancie from priority from the likes of Mega Scizor and Ash-Greninja, and it also helps by as well as revenge killing Greninja and Mega Lopunny. Dugtrio is a good partner because it can trap Assault Vest Magearna and Chansey, which are two of Mega Diancie's best switch-ins. Heatran can punish Mega Scizor, Ferrothorn, and Magearna, which Mega Diancie often baits in.

[SET]
name: Setup Sweeper
move 1: Rock Polish
move 2: Moonblast
move 3: Diamond Storm
move 4: Hidden Power Fire / Earth Power
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Rock Polish is best used late-game after bulkier threats such as Toxapex and Celesteela have been heavily weakened. After a boost, Mega Diancie can't be revenge killed by common Choice Scarf users such as Kartana or faster Pokemon such as Greninja and Tapu Koko. Calm Mind is an option over Rock Polish to better shred through bulkier cores, as Mega Diancie it can set it up on the likes of Mew and Clefable. Moonblast is Mega Diancie's best special STAB move that destroys Tyranitar, Zygarde, and Keldeo. Diamond Storm is very strong, (RC) and does more damage initially than unboosted Power Gem before a Calm Mind boost, making it superior on both Rock Polish and Calm Mind sets because of its overall higher damage output without needing to set up, as well as its ability to pressure pressuring Pokemon such as Chansey and Celesteela. Diamond Storm's potential +2 Defense boost can also be very helpful for setting up. Hidden Power Fire rounds off the set by hitting Mega Scizor, Ferrothorn, and most other Steel-types. Earth Power is an option for Toxapex as well as Magearna, and it's arguably the best option if using Calm Mind because of its better all-around coverage.

Set Details
========

Maximum Special Attack investment is best for powering up Mega Diancie's Moonblasts and coverage moves, while maximum Speed and a Naive nature are used to make Mega Diancie as fast as possible. A Rash nature can be used to heavily increase Mega Diancie's damage output in order for easier sweeps, but it significantly lessens Mega Diancie's usefulness earlier on in the match due to its lower Speed. Alternatively, a Naughty nature with maximum Attack investment can be used, but this suffers from the same issue. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams to still get to +2 Speed even if Sticky Web is up.

Usage Tips
========

The Rock Polish set functions very similarly to the All-Out Attacker set early-game, but (don't make them read the other set, copy paste if you must) perpreserving Mega Diancie's HP for late-game is very important so it can potentially sweep. It is still unwise to hard switch Mega Diancie into any attacks, and; instead, it's best to bring it in safely via momentum and double switching. Spamming Diamond Storm to try to and get a Defense boost before pulling off a sweep if all possible can be very beneficial, because Mega Scizor can't revenge kill Mega Diancie at +2 Defense, for example. There's no point in going for Rock Polish if the opponent still has an Ash-Greninja or Mega Scizor in the back, because Mega Diancie will just get revenge killed. Only go for Rock Polish when you are confident Mega Diancie won't be forced out afterwards. Calm Mind makes Mega Diancie more of a breaker that helps it muscle through the likes of Clefable, Mew, Toxapex, and even Tangrowth, so it can be played a bit more aggressively than its other sets. The choice of when to Mega Evolve depends very much on the matchup itself. Sometimes Mega Diancie can take advantage of abuse its bulk in its regular forme to set up on stronger attacks, such as Choice Scarf Latios's Psyshock or Tapu Koko's Wild Charge. Most of the time, it's just best to Mega Evolve as soon as possible to exploit abuse Mega Diancie's Speed and power throughout the entire match.

Team Options
========

Magnezone is more worth using with this set despite their common weakness to Dugtrio, because it can really help Rock Polish Mega Diancie pull off a sweep late-game by trapping Mega Scizor, Skarmory, and Celesteela. Tapu Lele is a very nice partner because it can protect Mega Diancie from priority moves from the likes of Ash-Greninja and Mega Scizor, allowing it to sweep late-game with Rock Polish in Psychic Terrain. Tapu Lele is also useful for its ability to wear down Steel-types and take advantage of Mega Venusaur and Toxapex. Spikes support from Ferrothorn and Greninja is are great because it allows Mega Diancie to sweep much more comfortably late-game, (RC) and keeps it from having to set up more than one Calm Mind. Tapu Koko can give Mega Diancie much-needed momentum while weakening the likes of Assault Vest Magearna, (RC) and Chansey, (RC) and pressuring Steel-types. Ash-Greninja can heavily weaken down defensive cores and appreciates the likes of Toxapex, Celesteela, and Magearna weakened, as well as Mega Diancie's ability to deter entry hazards. Heatran is once again a useful partner for its ability to switch into Grass-type moves and force out Steel-types. Swords Dance Landorus-T is useful versus stall, which Rock Polish Diancie has a very hard time really doing that much against. Lures for Mega Scizor and Celesteela are always nice, so something like Hidden Power Fire or Electrium Z Latios as well as Rockium Z Tapu Bulu can work.

[STRATEGY COMMENTS]
Other Options
=============

A set consisting of Substitute / Endeavor / Moonblast / Diamond Storm with maximum Attack investment can be effective, albeit niche, because it allows Mega Diancie to destroy a lot of bulky Pokemon such as Chansey, Celesteela, and Mew, (RC) due to its low HP stat. Endeavor can put these Pokemon in range of Diamond Storm if Mega Diancie is it's at a low enough amount of HP. Power Gem is decently strong and can work well with Calm Mind, but Diamond Storm is better in almost every way, especially when you factor in its high Defense-boosting probability. Magnet Rise can troll shut down (sorry lol) bulky Landorus-T because it can't really touch Mega Diancie, although offensive variants will still have a way around it. Magnet Rise can also be nice for Heatran, Garchomp, Mega Pinsir, and Dugtrio so it can't trap Mega Diancie the following turn. Hidden Power Ice can OHKO bulky Landorus-T after Stealth Rock, but it's not really worth missing out on the extra coverage Hidden Power Fire brings. Sharpen with maximum Attack investment can help Mega Diancie muscle through Chansey and Mega Venusaur, but not much else. Heal Bell can be nice on teams that are very weak to Toxic Spikes that don't run a hazard remover, and it's also just nice in general because it lets you play more aggressively with your Pokemon.

Checks and Counters
===================

**Chansey**: Chansey can tank basically anything Mega Diancie throws at it, even Diamond Storm. It only really dislikes maximum Attack variants because of their stronger Diamond Storms, but even then, Chansey can just stall it out with Soft-Boiled.

**Steel-types**: Mega Scizor is one of the best checks to Mega Diancie in the tier because of Technician-boosted Bullet Punch, and it can also while being able to switch into any move of Mega Diancie's except Hidden Power Fire. Assault Vest Magearna and specially defensive Jirachi can switch into basically any attack, even Earth Power, although not repeatedly continuously. Celesteela is a pretty risk-free switch-in to Mega Diancie as well, and it only really fears Nature Power in Electric Terrain. Specially defensive Skarmory can avoid the 2HKO from Hidden Power Fire and only fears Nature Power as well. Ferrothorn has to watch out for Hidden Power Fire, but it can easily take one and retaliate back with a Gyro Ball or Power Whip.

**Bulky Water-types**: Gastrodon avoids the 2HKO from Moonblast and takes very little from any other move, making it a very effective counter. Toxapex avoids the 2HKO from Diamond Storm very easily and can even avoid being 2HKOed by Earth Power. It only has to watch out for Nature Power in Electric Terrain. Suicune can avoid the 2HKO from Mega Diancie's its STAB moves and retaliate with a Scald. Protect can also help stalling out Electric Terrain.

**Bulky Grass-types**: Mega Venusaur can wall Mega Diancie pretty comfortably, especially when it's invested in physical defense, and threatens it with Giga Drain, fearing only the rare Psychic. Amoonguss can do much of the same, (RC) but has to be more wary of Diamond Storm, especially from maximum Attack variants. Assault Vest Tangrowth can avoid the 2HKO from both STAB moves, and it fears very little from Mega Diancie's coverage moves.

**Faster Revenge Killers**: Choice Scarfer users such as Keldeo, Garchomp, and Kartana, as well as faster threats such as both Greninja formes, Tapu Koko, Mega Lopunny, and Mega Alakazam, can outspeed and revenge kill Mega Diancie. Kingdra and Mega Swampert can also outspeed Mega Diancie in the rain, and Ash-Greninja can OHKO it with Water Shuriken (Greninja was mentioned in the previous sentence, is this different?). Dugtrio traps Mega Diancie and OHKOes it with Earthquake.
TY check implemented.
 

Lumari

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GP 2/2
[OVERVIEW]

Mega Diancie's strong offensive capabilities and above average Speed stat make it a top-tier pick in the OU metagame. Its Rock / Fairy typing along with good coverage options in Earth Power, Psychic, and Nature Power make it very difficult to switch into reliably, allowing it to tear apart common defensive cores. Mega Diancie's Magic Bounce ability allows it to pressure common entry hazard setters such as Garchomp, Smeargle, and Clefable, as well as give giving it an immunity to status moves. Mega Diancie also has access to Stealth Rock (RC) as well as setup options in Rock Polish and Calm Mind, making it quite versatile. Unfortunately, Mega Diancie's defensive stats are quite lackluster, leaving it very vulnerable to being revenge killed by common Choice Scarf users as well as faster Pokemon such as Greninja, Tapu Koko, and Mega Lopunny. This is made worse by Mega Diancie's common weaknesses to Ground-, Water-, Grass-, and Steel-type attacks. Mega Diancie is also very easily trapped by Dugtrio, limiting its effectiveness against stall as well as Mega Charizard Y teams.

[SET]
name: All-out Attacker
move 1: Moonblast
move 2: Diamond Storm
move 3: Hidden Power Fire
move 4: Nature Power / Earth Power / Stealth Rock
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Moonblast is Mega Diancie's strongest Fairy-type STAB move that hits Dragon-, Fighting-, and Dark-types, and it's just Diancie's hardest-hitting move in general with maximum Special Attack investment. Diamond Storm shreds Zapdos, Mega Pinsir, Mega Charizard Y, and Volcarona, as well as hitting the likes of Mega Venusaur and Amoonguss harder than anything else. Hidden Power Fire provides the most coverage for common Steel-types such as Ferrothorn and Mega Scizor, and it also dents Skarmory and non-Assault Vest Magearna. Nature Power in Electric Terrain becomes Thunderbolt, which blasts through Celesteela and Toxapex cores that normally give Mega Diancie trouble, and it provides all-around great coverage in general. Earth Power is the best option if you aren't using Tapu Koko as a teammate, because it hits Magearna and Mega Mawile harder than anything else while still nailing Toxapex (RC) and Magnezone (RC) and OHKOing Heatran. If you lack a Stealth Rock user, Mega Diancie is a good user of the move because it forces a lot of switches and can pressure common Defoggers such as Mew, Latios, Mantine, and Zapdos on stall. Mega Diancie also pressures Mega Sableye from bouncing switching in to bounce back Stealth Rock. Psychic is also an option because it hits Mega Venusaur very hard as well as Toxapex, but keep in mind that this would be best used on teams with Tapu Lele.

Set Details
========

Maximum Special Attack investment is best in this more physically bulky metagame, letting Mega Diancie hit Pokemon like Mew and Bold Clefable harder as well as powering up its other coverage moves. A Naive nature is preferred because Mega Diancie can somewhat take physical priority moves such as Fake Out, Sucker Punch, Ice Shard, Aerilate Quick Attack, and Extreme Speed. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams if you were unable to keep it off the field. Maximum Attack investment can be used to pressure Chansey more as well as to hit specially defensive Celesteela harder, but this makes Mega Diancie's other coverage moves and Moonblast significantly weaker, and it will miss out on OHKOing bulkier variants of Zygarde.

Usage Tips
========

Bring Mega Diancie in as much as possible to start punching holes into the opponent's team, as well as spamming Moonblast and Diamond Storm when appropriate. Going for Hidden Power Fire on a predicted Mega Scizor or Ferrothorn switch-in can be very beneficial, as it can help Mega Diancie retain a lot of momentum and force them to use Bullet Punch or switch out. This also goes for any of Mega Diancie's other coverage moves, because Mega Diancie should rarely ever stay in on something it can't OHKO due to its fragility. Avoid hard switching Mega Diancie into anything, (AC) and try to only bring it in on sacrifices, (AC) double switches, and free momentum; however, it can somewhat switch into weaker resisted attacks if absolutely necessary. Mega Evolving as soon as possible is very important because it allows Mega Diancie to be immune to status moves and pressure entry hazard setters like Smeargle, Chansey, and Mew.

Team Options
========

Tapu Koko is a great partner because Nature Power in Electric Terrain becomes Thunderbolt, which can make Mega Diancie very difficult to wall defensively. It also helps get Mega Diancie in for free with U-turn. Spikes support from the likes of Ferrothorn and both Greninja formes is really nice because it can help Mega Diancie pressure Pokemon such as Mew, Magearna, and Toxapex. Toxapex itself is a good teammate because it can set up Toxic Spikes, which are useful for wearing down switch-ins such as Assault Vest Tangrowth. Similarly, Assault Vest Tangrowth is a good partner because it can switch into Ash-Greninja as well as take hits from common revenge killers such as Choice Scarf Kartana, Keldeo, and Garchomp. Choice Scarf Tapu Lele protects Mega Diancie from priority from the likes of Mega Scizor and Ash-Greninja, and it also helps by revenge killing Greninja and Mega Lopunny. Dugtrio is a good partner because it can trap Assault Vest Magearna and Chansey, which are two of Mega Diancie's best switch-ins. Heatran can punish Mega Scizor, Ferrothorn, and Magearna, which Mega Diancie often baits in.

[SET]
name: Setup Sweeper
move 1: Rock Polish
move 2: Moonblast
move 3: Diamond Storm
move 4: Hidden Power Fire / Earth Power
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Rock Polish is best used late-game after bulkier threats such as Toxapex and Celesteela have been heavily weakened. After a boost, Mega Diancie can't be revenge killed by common Choice Scarf users such as Kartana or faster Pokemon such as Greninja and Tapu Koko. Calm Mind is an option over Rock Polish to better shred through bulkier cores, as Mega Diancie can set it up on the likes of Mew and Clefable. Moonblast is Mega Diancie's best special STAB move that destroys Tyranitar, Zygarde, and Keldeo. Diamond Storm is very strong and does more damage than unboosted Power Gem, making it superior on both Rock Polish and Calm Mind sets because of its overall higher damage output without needing to set up (RC) as well as its ability to pressure Pokemon such as Chansey and Celesteela. Diamond Storm's The potential +2 Defense boost can also be very helpful for setting up. Hidden Power Fire rounds off the set by hitting Mega Scizor, Ferrothorn, and most other Steel-types. Earth Power is an option for Toxapex as well as Magearna, and it's arguably the best option if using Calm Mind because of its better all-around coverage.

Set Details
========

Maximum Special Attack investment is best for powering up Mega Diancie's Moonblasts and coverage moves, while maximum Speed and a Naive nature are used to make Mega Diancie as fast as possible. A Rash nature can be used to heavily increase Mega Diancie's damage output in order for easier sweeps, but it significantly lessens Mega Diancie's usefulness earlier on in the match due to its lower Speed. Alternatively, a Naughty nature with maximum Attack investment can be used, but this suffers from the same issue. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams to still get to +2 Speed even if Sticky Web is up.

Usage Tips
========

Preserving Mega Diancie's HP for late-game is very important so it can potentially sweep. It is unwise to hard switch Mega Diancie into any attacks; instead, it's best to bring it in safely via momentum and double switching. Spamming Diamond Storm to try to get a Defense boost before pulling off a sweep if all possible can be very beneficial, because Mega Scizor can't revenge kill Mega Diancie at +2 Defense, for example. There's no point in going for Rock Polish if the opponent still has an Ash-Greninja or Mega Scizor in the back, because Mega Diancie will just get revenge killed. Only go for Rock Polish when you are confident Mega Diancie won't be forced out afterwards. Calm Mind makes Mega Diancie more of a breaker that helps it muscle through the likes of Clefable, Mew, Toxapex, and even Tangrowth, so it can be played a bit more aggressively than its other sets. The choice of when to Mega Evolve depends very much on the matchup itself. Sometimes Mega Diancie can take advantage of its bulk in its regular forme before Mega Evolving to set up on stronger attacks, such as Choice Scarf Latios's Psyshock or and Tapu Koko's Wild Charge. Most of the time, though, it's just best to Mega Evolve as soon as possible to exploit Mega Diancie's Speed and power throughout the entire match.

Team Options
========

Magnezone is worth (remove strikethrough) using with this set despite their common the shared weakness to Dugtrio, because it can really help Rock Polish Mega Diancie pull off a sweep late-game by trapping Mega Scizor, Skarmory, and Celesteela. Tapu Lele is a very nice partner because it can protect Mega Diancie from priority moves from the likes of Ash-Greninja and Mega Scizor, allowing it to sweep late-game with Rock Polish in Psychic Terrain. Tapu Lele is also useful for its ability to wear down Steel-types and take advantage of Mega Venusaur and Toxapex. Spikes support from Ferrothorn and Greninja is great because it allows Mega Diancie to sweep much more comfortably late-game and keeps it from having to set up more than one Calm Mind. Tapu Koko can give Mega Diancie much-needed momentum while weakening the likes of Assault Vest Magearna and Chansey and pressuring Steel-types. Ash-Greninja can heavily weaken down defensive cores and appreciates the likes of Toxapex, Celesteela, and Magearna weakened, as well as Mega Diancie's ability to deter entry hazards. Heatran is a useful partner for its ability to switch into Grass-type moves and force out Steel-types. Swords Dance Landorus-T is useful versus stall, which Rock Polish Diancie has a very hard time really doing that much against. Lures for Mega Scizor and Celesteela are always nice, so something like Hidden Power Fire or Electrium Z Latios as well as Rockium Z Tapu Bulu can work.

[STRATEGY COMMENTS]
Other Options
=============

A set consisting of Substitute / Endeavor / Moonblast / Diamond Storm with maximum Attack investment can be effective, albeit niche, because it allows Mega Diancie to destroy a lot of bulky Pokemon such as Chansey, Celesteela, and Mew due to its low HP stat. Endeavor can put these Pokemon in range of Diamond Storm if Mega Diancie is at a low enough amount of HP. Power Gem is decently strong and can work well with Calm Mind, but Diamond Storm is better in almost every way, especially when you factor in its high Defense-boosting probability. Magnet Rise can shut down bulky Landorus-T because it can't really touch Mega Diancie, although offensive variants will still have a way around it. Magnet Rise can also be nice for Heatran, Garchomp, Mega Pinsir, and Dugtrio so it can't trap Mega Diancie the following turn. Hidden Power Ice can OHKO bulky Landorus-T after Stealth Rock, but it's not really worth missing out on the extra coverage Hidden Power Fire brings. Sharpen with maximum Attack investment can help Mega Diancie muscle through Chansey and Mega Venusaur, but not much else. Heal Bell can be nice on teams that are very weak to Toxic Spikes that don't run a hazard remover, and it's also just nice in general because it lets you play more aggressively with your Pokemon.

Checks and Counters
===================

**Chansey**: Chansey can tank basically anything Mega Diancie throws at it, even Diamond Storm. It only really dislikes maximum Attack variants because of their stronger Diamond Storms, but even then, Chansey can just stall it (prob "them" if you're referring to max Attack variants, or "the move's PP" if that's what you mean) out with Soft-Boiled.

**Steel-types**: Mega Scizor is one of the best checks to Mega Diancie in the tier because of Technician-boosted Bullet Punch, and it can also switch into any move of Mega Diancie's except Hidden Power Fire. Assault Vest Magearna and specially defensive Jirachi can switch into basically any attack, even Earth Power, although not repeatedly. Celesteela is a pretty risk-free switch-in to Mega Diancie as well, and it only really fears Nature Power in Electric Terrain. Specially defensive Skarmory can avoid the 2HKO from Hidden Power Fire and only fears Nature Power as well. Ferrothorn has to watch out for Hidden Power Fire, but it can easily take one and retaliate back with a Gyro Ball or Power Whip.

**Bulky Water-types**: Gastrodon avoids the 2HKO from Moonblast and takes very little from any other move, making it a very effective counter. Toxapex avoids the 2HKO from Diamond Storm very easily and can even avoid being 2HKOed by Earth Power. It only has to watch out for Nature Power in Electric Terrain. Suicune can avoid the 2HKO from Mega Diancie's STAB moves and retaliate with a Scald. Protect can also help stalling out Electric Terrain.

**Bulky Grass-types**: Mega Venusaur can wall Mega Diancie pretty comfortably, especially when it's invested in physical defense bulk, and threatens it with Giga Drain, fearing only the rare Psychic. Amoonguss can do much of the same but has to be more wary of Diamond Storm, especially from maximum Attack variants. Assault Vest Tangrowth can avoid the 2HKO from both STAB moves, and it fears very little from Mega Diancie's coverage moves.

**Faster Revenge Killers**: Choice Scarf users such as Keldeo, Garchomp, and Kartana, as well as faster threats such as both Greninja formes, Tapu Koko, Mega Lopunny, and Mega Alakazam, can outspeed and revenge kill Mega Diancie. Kingdra and Mega Swampert can also outspeed Mega Diancie in the rain, and Ash-Greninja can OHKO it with Water Shuriken. Dugtrio traps Mega Diancie and OHKOes it with Earthquake.
 
Last edited:

Gary

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GP 2/2
[OVERVIEW]

Mega Diancie's strong offensive capabilities and above average Speed stat make it a top-tier pick in the OU metagame. Its Rock / Fairy typing along with good coverage options in Earth Power, Psychic, and Nature Power make it very difficult to switch into reliably, allowing it to tear apart common defensive cores. Mega Diancie's Magic Bounce ability allows it to pressure common entry hazard setters such as Garchomp, Smeargle, and Clefable, as well as give giving it an immunity to status moves. Mega Diancie also has access to Stealth Rock (RC) as well as setup options in Rock Polish and Calm Mind, making it quite versatile. Unfortunately, Mega Diancie's defensive stats are quite lackluster, leaving it very vulnerable to being revenge killed by common Choice Scarf users as well as faster Pokemon such as Greninja, Tapu Koko, and Mega Lopunny. This is made worse by Mega Diancie's common weaknesses to Ground-, Water-, Grass-, and Steel-type attacks. Mega Diancie is also very easily trapped by Dugtrio, limiting its effectiveness against stall as well as Mega Charizard Y teams.

[SET]
name: All-out Attacker
move 1: Moonblast
move 2: Diamond Storm
move 3: Hidden Power Fire
move 4: Nature Power / Earth Power / Stealth Rock
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Moonblast is Mega Diancie's strongest Fairy-type STAB move that hits Dragon-, Fighting-, and Dark-types, and it's just Diancie's hardest-hitting move in general with maximum Special Attack investment. Diamond Storm shreds Zapdos, Mega Pinsir, Mega Charizard Y, and Volcarona, as well as hitting the likes of Mega Venusaur and Amoonguss harder than anything else. Hidden Power Fire provides the most coverage for common Steel-types such as Ferrothorn and Mega Scizor, and it also dents Skarmory and non-Assault Vest Magearna. Nature Power in Electric Terrain becomes Thunderbolt, which blasts through Celesteela and Toxapex cores that normally give Mega Diancie trouble, and it provides all-around great coverage in general. Earth Power is the best option if you aren't using Tapu Koko as a teammate, because it hits Magearna and Mega Mawile harder than anything else while still nailing Toxapex (RC) and Magnezone (RC) and OHKOing Heatran. If you lack a Stealth Rock user, Mega Diancie is a good user of the move because it forces a lot of switches and can pressure common Defoggers such as Mew, Latios, Mantine, and Zapdos on stall. Mega Diancie also pressures Mega Sableye from bouncing switching in to bounce back Stealth Rock. Psychic is also an option because it hits Mega Venusaur very hard as well as Toxapex, but keep in mind that this would be best used on teams with Tapu Lele.


Set Details
========

Maximum Special Attack investment is best in this more physically bulky metagame, letting Mega Diancie hit Pokemon like Mew and Bold Clefable harder as well as powering up its other coverage moves. A Naive nature is preferred because Mega Diancie can somewhat take physical priority moves such as Fake Out, Sucker Punch, Ice Shard, Aerilate Quick Attack, and Extreme Speed. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams if you were unable to keep it off the field. Maximum Attack investment can be used to pressure Chansey more as well as to hit specially defensive Celesteela harder, but this makes Mega Diancie's other coverage moves and Moonblast significantly weaker, and it will miss out on OHKOing bulkier variants of Zygarde.

Usage Tips
========

Bring Mega Diancie in as much as possible to start punching holes into the opponent's team, as well as spamming Moonblast and Diamond Storm when appropriate. Going for Hidden Power Fire on a predicted Mega Scizor or Ferrothorn switch-in can be very beneficial, as it can help Mega Diancie retain a lot of momentum and force them to use Bullet Punch or switch out. This also goes for any of Mega Diancie's other coverage moves, because Mega Diancie should rarely ever stay in on something it can't OHKO due to its fragility. Avoid hard switching Mega Diancie into anything, (AC) and try to only bring it in on sacrifices, (AC) double switches, and free momentum; however, it can somewhat switch into weaker resisted attacks if absolutely necessary. Mega Evolving as soon as possible is very important because it allows Mega Diancie to be immune to status moves and pressure entry hazard setters like Smeargle, Chansey, and Mew.

Team Options
========

Tapu Koko is a great partner because Nature Power in Electric Terrain becomes Thunderbolt, which can make Mega Diancie very difficult to wall defensively. It also helps get Mega Diancie in for free with U-turn. Spikes support from the likes of Ferrothorn and both Greninja formes is really nice because it can help Mega Diancie pressure Pokemon such as Mew, Magearna, and Toxapex. Toxapex itself is a good teammate because it can set up Toxic Spikes, which are useful for wearing down switch-ins such as Assault Vest Tangrowth. Similarly, Assault Vest Tangrowth is a good partner because it can switch into Ash-Greninja as well as take hits from common revenge killers such as Choice Scarf Kartana, Keldeo, and Garchomp. Choice Scarf Tapu Lele protects Mega Diancie from priority from the likes of Mega Scizor and Ash-Greninja, and it also helps by revenge killing Greninja and Mega Lopunny. Dugtrio is a good partner because it can trap Assault Vest Magearna and Chansey, which are two of Mega Diancie's best switch-ins. Heatran can punish Mega Scizor, Ferrothorn, and Magearna, which Mega Diancie often baits in.

[SET]
name: Setup Sweeper
move 1: Rock Polish
move 2: Moonblast
move 3: Diamond Storm
move 4: Hidden Power Fire / Earth Power
item: Diancite
ability: Clear Body
nature: Naive
evs: 4 Atk / 252 SpA / 252 Spe

[SET COMMENTS]
Moves
========

Rock Polish is best used late-game after bulkier threats such as Toxapex and Celesteela have been heavily weakened. After a boost, Mega Diancie can't be revenge killed by common Choice Scarf users such as Kartana or faster Pokemon such as Greninja and Tapu Koko. Calm Mind is an option over Rock Polish to better shred through bulkier cores, as Mega Diancie can set it up on the likes of Mew and Clefable. Moonblast is Mega Diancie's best special STAB move that destroys Tyranitar, Zygarde, and Keldeo. Diamond Storm is very strong and does more damage than unboosted Power Gem, making it superior on both Rock Polish and Calm Mind sets because of its overall higher damage output without needing to set up (RC) as well as its ability to pressure Pokemon such as Chansey and Celesteela. Diamond Storm's The potential +2 Defense boost can also be very helpful for setting up. Hidden Power Fire rounds off the set by hitting Mega Scizor, Ferrothorn, and most other Steel-types. Earth Power is an option for Toxapex as well as Magearna, and it's arguably the best option if using Calm Mind because of its better all-around coverage.


Set Details
========

Maximum Special Attack investment is best for powering up Mega Diancie's Moonblasts and coverage moves, while maximum Speed and a Naive nature are used to make Mega Diancie as fast as possible. A Rash nature can be used to heavily increase Mega Diancie's damage output in order for easier sweeps, but it significantly lessens Mega Diancie's usefulness earlier on in the match due to its lower Speed. Alternatively, a Naughty nature with maximum Attack investment can be used, but this suffers from the same issue. Clear Body is Diancie's only ability before Mega Evolution, and it can be useful against Sticky Web teams to still get to +2 Speed even if Sticky Web is up.

Usage Tips
========

Preserving Mega Diancie's HP for late-game is very important so it can potentially sweep. It is unwise to hard switch Mega Diancie into any attacks; instead, it's best to bring it in safely via momentum and double switching. Spamming Diamond Storm to try to get a Defense boost before pulling off a sweep if all possible can be very beneficial, because Mega Scizor can't revenge kill Mega Diancie at +2 Defense, for example. There's no point in going for Rock Polish if the opponent still has an Ash-Greninja or Mega Scizor in the back, because Mega Diancie will just get revenge killed. Only go for Rock Polish when you are confident Mega Diancie won't be forced out afterwards. Calm Mind makes Mega Diancie more of a breaker that helps it muscle through the likes of Clefable, Mew, Toxapex, and even Tangrowth, so it can be played a bit more aggressively than its other sets. The choice of when to Mega Evolve depends very much on the matchup itself. Sometimes Mega Diancie can take advantage of its bulk in its regular forme before Mega Evolving to set up on stronger attacks, such as Choice Scarf Latios's Psyshock or and Tapu Koko's Wild Charge. Most of the time, though, it's just best to Mega Evolve as soon as possible to exploit Mega Diancie's Speed and power throughout the entire match.


Team Options
========

Magnezone is worth (remove strikethrough) using with this set despite their common the shared weakness to Dugtrio, because it can really help Rock Polish Mega Diancie pull off a sweep late-game by trapping Mega Scizor, Skarmory, and Celesteela. Tapu Lele is a very nice partner because it can protect Mega Diancie from priority moves from the likes of Ash-Greninja and Mega Scizor, allowing it to sweep late-game with Rock Polish in Psychic Terrain. Tapu Lele is also useful for its ability to wear down Steel-types and take advantage of Mega Venusaur and Toxapex. Spikes support from Ferrothorn and Greninja is great because it allows Mega Diancie to sweep much more comfortably late-game and keeps it from having to set up more than one Calm Mind. Tapu Koko can give Mega Diancie much-needed momentum while weakening the likes of Assault Vest Magearna and Chansey and pressuring Steel-types. Ash-Greninja can heavily weaken down defensive cores and appreciates the likes of Toxapex, Celesteela, and Magearna weakened, as well as Mega Diancie's ability to deter entry hazards. Heatran is a useful partner for its ability to switch into Grass-type moves and force out Steel-types. Swords Dance Landorus-T is useful versus stall, which Rock Polish Diancie has a very hard time really doing that much against. Lures for Mega Scizor and Celesteela are always nice, so something like Hidden Power Fire or Electrium Z Latios as well as Rockium Z Tapu Bulu can work.


[STRATEGY COMMENTS]
Other Options
=============

A set consisting of Substitute / Endeavor / Moonblast / Diamond Storm with maximum Attack investment can be effective, albeit niche, because it allows Mega Diancie to destroy a lot of bulky Pokemon such as Chansey, Celesteela, and Mew due to its low HP stat. Endeavor can put these Pokemon in range of Diamond Storm if Mega Diancie is at a low enough amount of HP. Power Gem is decently strong and can work well with Calm Mind, but Diamond Storm is better in almost every way, especially when you factor in its high Defense-boosting probability. Magnet Rise can shut down bulky Landorus-T because it can't really touch Mega Diancie, although offensive variants will still have a way around it. Magnet Rise can also be nice for Heatran, Garchomp, Mega Pinsir, and Dugtrio so it can't trap Mega Diancie the following turn. Hidden Power Ice can OHKO bulky Landorus-T after Stealth Rock, but it's not really worth missing out on the extra coverage Hidden Power Fire brings. Sharpen with maximum Attack investment can help Mega Diancie muscle through Chansey and Mega Venusaur, but not much else. Heal Bell can be nice on teams that are very weak to Toxic Spikes that don't run a hazard remover, and it's also just nice in general because it lets you play more aggressively with your Pokemon.

Checks and Counters
===================

**Chansey**: Chansey can tank basically anything Mega Diancie throws at it, even Diamond Storm. It only really dislikes maximum Attack variants because of their stronger Diamond Storms, but even then, Chansey can just stall it (prob "them" if you're referring to max Attack variants, or "the move's PP" if that's what you mean) out with Soft-Boiled.

**Steel-types**: Mega Scizor is one of the best checks to Mega Diancie in the tier because of Technician-boosted Bullet Punch, and it can also switch into any move of Mega Diancie's except Hidden Power Fire. Assault Vest Magearna and specially defensive Jirachi can switch into basically any attack, even Earth Power, although not repeatedly. Celesteela is a pretty risk-free switch-in to Mega Diancie as well, and it only really fears Nature Power in Electric Terrain. Specially defensive Skarmory can avoid the 2HKO from Hidden Power Fire and only fears Nature Power as well. Ferrothorn has to watch out for Hidden Power Fire, but it can easily take one and retaliate back with a Gyro Ball or Power Whip.


**Bulky Water-types**: Gastrodon avoids the 2HKO from Moonblast and takes very little from any other move, making it a very effective counter. Toxapex avoids the 2HKO from Diamond Storm very easily and can even avoid being 2HKOed by Earth Power. It only has to watch out for Nature Power in Electric Terrain. Suicune can avoid the 2HKO from Mega Diancie's STAB moves and retaliate with a Scald. Protect can also help stalling out Electric Terrain.

**Bulky Grass-types**: Mega Venusaur can wall Mega Diancie pretty comfortably, especially when it's invested in physical defense bulk, and threatens it with Giga Drain, fearing only the rare Psychic. Amoonguss can do much of the same but has to be more wary of Diamond Storm, especially from maximum Attack variants. Assault Vest Tangrowth can avoid the 2HKO from both STAB moves, and it fears very little from Mega Diancie's coverage moves.


**Faster Revenge Killers**: Choice Scarf users such as Keldeo, Garchomp, and Kartana, as well as faster threats such as both Greninja formes, Tapu Koko, Mega Lopunny, and Mega Alakazam, can outspeed and revenge kill Mega Diancie. Kingdra and Mega Swampert can also outspeed Mega Diancie in the rain, and Ash-Greninja can OHKO it with Water Shuriken. Dugtrio traps Mega Diancie and OHKOes it with Earthquake.
Thanks man. This is done.
 

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