Playable on Main Server
*challenge only
1v1
Both sides bring three Pokemon to battle, and only send out one each. This metagame moves quite quickly and centers around offense. Self-KO moves, Swagger, Soul Dew, Kangaskhanite, and Focus Sash are banned. Species Clause is turned off.
2v2 Doubles*
Based on standard Doubles, both sides bring four Pokemon but only send out two on each side. These two Pokemon battle against the opponent's two Pokemon; the user to defeat both of the opponent's Pokemon win. Self-KO moves are banned from this metagame.
(Almost) Any Ability / AAA
Give almost any ability you want with a few exceptions. A few abilities and Pokemon are banned, see thread for the full list.
Anything Goes
Anything Goes is a metagame where players are able to use anything they want, as long as it abides with the game's rules.
Averagemons*
All Pokemon's stats are changed to 100 across the board. Huge/Pure Power, Eviolite, Smeargle, Shedinja, and unique items that increase the attacks or defenses (like Thick Club) are banned.
Balanced Hackmons
Pick any ability or moves you want. Bans include no OHKO, Shadow Tag, Wonder Guard, Huge/Pure Power, Arena Trap, and Parental Bond. You also can't run an ability more than twice on your team.
Hidden Type*
Extra types are added to your Pokemon depending on the IVs that would determine the type of the move Hidden Power. For example, 31 IVs in every stat would add the Dark-type to a Pokemon. Three types are possible, too. For example, if you changed Keldeo's IVs required to produce the Ice-type, it would become Water/Fighting/Ice.
Inverse Battle Metagame
Inverts the type chart so ineffective moves become super-effective moves and vice versa. Ability immunities stay the same. Kyurem-Black and Snorlax are banned.
Monotype
Build a team of 6 Pokemon that all share a common type. Mega Evolutions are allowed on their base form's team, so Mega Charizard X is allowed on a Mono-Flying team because regular Charizard is Fire/Flying, while Mega Pinsir is not allowed on a Mono-Flying team because it is only a Bug-type in its base form.
OU Theorymon (ladder discussion)
A project that asks "what if" when a new typing, move, or ability is added to a Pokemon. The Pokemon are swapped in and out after a few days.
STABmons
Give any move you want that matches a Pokemon of the same type. For example, Keldeo learns all Fighting and Water moves. Pre-evolution type changes carry forward as well. Sylveon and Porygon-Z are banned. Darkrai, Deoxys-D, and Deoxys-S are unbanned.
Tier Shift
All Pokemon in the tiers below OU gain buffs to their stats, turning formally uncompetitive Pokemon into threats worthy of OU status. OU/BL are not boosted, UU/BL2 gain +5, RU/BL3 gain +10, NU gain +15, and PU and below gain +20.
Playable on ROM Server
*challenge only
Acid Rain
All four weathers exist at once, producing some strange outcomes to weather-related moves and abilities. Castform and Weather Ball are banned.
Accessorize
Accessorize is a metagame where several new items, or "accessories", are introduced. Each of these accessories will add or change the secondary typing and will give a 50 base point bonus along with a 10 base point penalty.
Burning Mon'
Every Pokemon is burned as they enter the battle field and stay burned the entire match. Fire-types are unaffected.
Custom Power
A metagame where the first moveslot's "type" changes according to the Pokemon's Hidden Power IVs.
EXTREME Tier Shift
In Extreme Tier Shift, it follows all rules of Ubers, and Pokemon in lower tiers get stat boosts in order to balance it out.
Follow The Leader
Every Pokemon on a team has access to ALL of the moves and abilities the first Pokemon slot on the team has, but they lose access to their own movepool and abilities.
Gods and Followers
Each team has one "God" and five "Followers". The Followers must share one type with the God. If the God faints, the Followers are afflicted with a Curse effect.
Got Talent
An unique metagame where moves are now separated into their contest conditions. Each move now uses the stat correlating with its contest condition for damage calculation such as Cool with Attack, Tough with Defense, etc.
Gift of the Gods
A metagame where a team gets one Uber that then distributes its stats to the corresponding teamslot. For example, Yveltal would give its HP stat to the Pokemon in the first slot, its Attack to the Pokemon in the second slot, and so on.
Head Start
Every Pokemon receives a "Gale Wings-like" ability that corresponds with their secondary typing, giving them priority on these moves.
Inheritance
Pokemon are able to inherit from other Pokemon and use their abilities and moves, but not their own unless they chose to inherit from themselves. Keldeo, Kyurem-B, Regigigas, Shedinja, and Slaking are banned. Inheriting Wonder Guard, Pure Power, Huge Power, Shadow Tag, Imposter, Parental Bond or anything from Smeargle is banned as well.
Itemize
Itemize removes the species restriction on non-form changing items.
Mix & Mega
Pokemon receive typing, stats, and ability changes when using another Pokemon's mega stone. For example, a Pokemon holding Altarianite would receive Atk +40, Def +20, Sp. Atk +40, gain a secondary Fairy typing, and Pixilate.
Monogen
Your team must consist of 6 Pokemon all from the same generation. Mega forms are considered to be from the same generation as their base form.
Nature Swap
In Nature Swap, a pokemon's base stats are swapped based on their nature. For instance, a Landorus-T with Impish nature will have his Defense and Special Attack swapped, with a new base 105 Defense stat and a new base 90 Special Attack stat.
Palette Pals
All Pokemon that share the same dex colour (this/these Pokemon are called "stat receivers") as the Pokemon closest to the 1st slot in the teambuilder (this Pokemon is called the "stat giver") get to share the stat giver's base stats.
Powered Up!
This metagame doubles the effects of all abilities. Specific abilities without effects able to be doubled do not receive a buff.
Protect: The Metagame
In this metagame, Protect and its variants do not fail with consecutive uses.
Reliablemons
Changes the type of the first move in a Pokemon's moveslot to match its primary type, and changes the type of the second move to match its secondary type, if applicable.
Return'd
A metagame where the move in the first slot has its base power determined by the happiness value, using the same formula as Return.
Stat Switch
Swaps the highest stat and lowest stat of each Pokemon. If there are multiple highest and lowest (so if both Attack and Defense are highest), they are switched together. For example, Keldeo's highest stat is Special Attack, which switches with its lowest stat, Attack. Another example, Regice, has two lowest stats (Attack/Speed), which both switch with its highest stat, Special Defense.
Super-Effectivemons
Give any move you want to Pokemon that are weak to that type(s). For example, Keldeo learns all Electric, Grass, Flying, Psychic, and Fairy moves in addition to its usual moves. Pre-evolution type changes carry forward as well and abilities are ignored when factoring weaknesses. Hidden abilities are released.
Type Reflectors
Teams are "monotype'd" by taking the primary type of the Pokemon in the first slot and adding it on as a new secondary type to all other Pokemon in the party, replacing old secondary types or giving Pokemon a new dual typing.
Playable, but not on ROM
*challenge only
350 Cup
An Ubers based metagame in which every Pokemon with a base stat total of 350 or less has its stats doubled. Eviolite, Light Ball, Thick Club, DeepSeaScale, and DeepSeaTooth are banned. Darumaka and Pawniard are also banned.
Anti-Vaxxers
This metagame aims to figure out how well Pokemon fare without their immunities given based on their typing (i.e. burn immunity on Fire-types, Poison immunity on Steel- and Poison-types, etc.)
Haxmons
If hax can happen, it will happen: any move with a chance to miss will miss; every move that hits will crit; and every move with a secondary effect activates that effect. King's Rock is banned.
Hemiswap
Hemiswap is a metagame where you "trade" half of your team to your opponent before the match begins. Think of your first three slots and your last three slots as separate "halves." Right before the match, Showdown! flips a metaphorical coin. Heads, it picks the first half of your team, tails, it picks the second half. Then, the Pokemon in that half are now a part of your opponent's team, and vice versa. Finally, the game progresses to team preview as normal.
Variations
There are variations of every type based ability.
Coded, but not playable
Ability Shift
All abilities are replaced with the next one alphabetically. For example, Protean becomes Pure Power.
Ability Unity
Pokemon that share the same type can now share abilities. For example, since Keldeo and Poliwrath have both Fighting and Water types, they can each use either Justified, Water Absorb, Swift Swim, and Damp. Huge Power, Pure Power, Parental Bond, Simple, Shadow Tag, Arena Trap, Fur Coat, Forecast, Flower Gift, Speed Boost, Prankster, and Zen Mode are banned. So are Slaking, Regigigas, and Archeops.
Alphabet Cup
Give any move you want to a Pokemon that share the same first letter. For example, Keldeo learns all K moves in addition to its usual moves. There is a limit to one Pokemon per letter (can't have both Keldeo and Kingdra).
Backfire
Moves that have a chance to affect the foe/user have an equal chance to affect the user/foe.
Highest Stat Meta / HSM
Only Pokemon that share the same highest stat can be on the same team. For example, Keldeo can be on a team of other Pokemon that have Special Attack as their highest stat. Pokemon with multiple highest stats are usable on multiple corresponding teams. For example, Ninetales is usable on both Speed and Special Defense teams because those are both its highest stats.
Linked
A metagame that is similar to the Link Shop in Pokemon Mystery Dungeon, the first two moves of a Pokemon's set are linked into one.
Mediocre-Mons
Only Pokemon with every stat less than 100 are eligible. Huge/Pure Power and Clefable are banned.
MegaMons
Based on Ubers, you can have more than 1 Mega Evolution per team and they can be used without their mega stones. The Mega Mewtwos and Mega Gengar are banned.
Metagamiate
Every type gets an -iate ability and every Pokemon receives one based on their primary type. For example, all primary Ice-types gain Refrigerate plus what ability they usually have.
Middle Cup
Only middle evolution Pokemon are eligible and play is set at level 50. Eviolite is banned.
MonsJustMons
You can no longer use items, abilities, natures, EVs, or IVs. It's Pokemon plain and simple. Slaking and Regigigas are banned.
No Guard Galaxy
All moves have perfect accuracy just like the move Swift.
NO STATUS
No status moves are allowed.
Protean Palace
All Pokemon receive the ability Protean alongside the ability they usually have.
Same Type Stealth Rock
Stealth Rock is now the same type as the primary type of the user. For example, if Skarmory uses the move, it will be the Steel-type.
Unreleased OU
"Frees" current unreleased items and Pokemon such as Gems.
VoltTurn Mayhem
Every move forces the user to switch, like U-turn or Volt Switch.
Not Coded / Hosted
1v1 Reversed
Essentially this is the same as 1v1, but instead of picking what move to use, you pick what move your opponent will use (against you).
400
In 400, all Pokemon that have a Base Stat Total of 400 or less gets access to any move in the game. This creates for some wild combinations such as Shift Gear Beedrill, Perish Song Gothorita, and even Spore Sableye! Only OHKO moves are banned in this metagame.
AAA Ubers
An Ubers-based version of AAA. Simple, Contrary, Fur Coat, Huge/Pure Power, Speed Boost, Imposter, Shadow Tag, Arena Trap, Parental Bond, Wonder Guard, and Sturdy Shedinja are banned.
Adaptability
All Pokemon will only have one type, their primary if they are regular and their secondary if they are shiny, and all Pokemon will resist the type they lost. All Pokemon have the ability Adaptability hard-coded. For example, Sableye will have both Prankster and Adaptability.
All Stars
Teams must consist of 1 OU, 2 UU, 2 RU, and 1 NU Pokemon.
Alphability
Give any ability you want to a Pokemon that share the same first letter. For example, Keldeo learns all K abilities but no longer can used Justified. Huge/Pure Power and Moody are banned. Mega evolutions keep the ability of their base form.
Atk-Def Equality
The highest stat between Attack and Defense becomes the new stat for both. Same with Special Attack and Defense. For example, Keldeo has a Special Attack of 129, which is higher than its Special Defense of 90, so both stats are now 129. The process is repeated for Attack/Defense.
Base Power Damage
Move's base damage hits for that set amount. For example, High Jump Kick hits for a consistent 130 damage each time.
Basic Elements
Types are split into the three basic ones: Fire, Water, Grass.
Baton Pass Marathon
Regular switching is now treated like Baton Pass, so boosts remain permanent until the chain is broken. Perish Song and status moves that lower Accuracy are banned.
Battle Stance
Pokemon receive the Aegislash-effect where, when they attack, they change into offensive forms; when they use Protect variants they are brought back to defensive form.
BeGRUDGEd
The move you KO your opponent with is depleted of all of its PP, similar to the effects of the move Grudge.
Binary Battles
Binary Battles is inspired by the triples format, where you have three Pokemon fighting at once. However, when the central Pokemon is left out, the sides will basically fight two battles at the same time, as long as they don't have any Flying- or Pulse-moves. This OM takes this concept a little further, removing the aspects specific to triples (Flying-type moves hitting the other side, Quick Guard, etc.This basically allows two single battles to be played at the same time. The catch is that you still use 1 team, so you have 6 Pokemon to cover both battles. It's a challenge to plan over both of them and keep track of your Pokemon, so that they can keep covering the opponent. For example, you can take advantage of the Pokemon on the other side to make sure it can't cover the other side, or pressure both sides in a way that they would need to send out the same Pokemon on both sides!
Blindmons
Blindmons is a metagame where team preview is removed, the species and name of opposing Pokemon are invisible, and their first two moves are visible instead.
Brackets
Priority brackets are shifted.
Camomons
Pokemon change type to match their first two moves. For example, Keldeo with Hydro Pump and Secret Sword will still be Water/Fighting, but if it ran Hydro Pump and Calm Mind in the first two slots instead, it would be Water/Psychic.
Chart Shift
Type effectiveness is shifted one spot to the left on the type chart. For example, Normal is now weak to Poison and Steel, resists Fighting, Bug, and Dark, and is immune to Dragon.
Classic Elements
Types go back to Gen 3 mechanics and become either all physical or special. Fairy becomes Special.
Class Warfare
Types are separated into 4 unique classes, each with their own class advantage that acts as a Download boost, giving unique stat boosts dependent on the class of the Pokemon.
Clockmons
Doubles the time of field effects like weather and terrain, while also making field hazards disappear over time.
COMBOmons
A metagame where Pokemon get a bunch of abilities based on specific "categories". Each category gives you ALL the abilities in said category so long as you pick one of the abilities in a particular category.
Contrary Doubles
In this metagame, all moves/abilities that are associated with a Pokemon's stats have their effects reversed (so kinda like Contrary). For example, in this metagame, Speed Boost will lower your speed by 1 at the end of each turn, and Screech will raise your target's Defense by 2. Status effects, such as burn and paralysis, also have their effects reversed. Burn now multiplies your Attack by 1.5, and paralysis has your Speed quadrupled. However, status effects such as Poison retain their same effect, since it isn't associated with stats.
Coveragemons
STAB is now x1 while Different Type Attack Bonus, or DTAB, is boosted to x1.5, which means coverage moves are now stronger than STAB moves.
Cross Evolution
This metagame allows "cross evolving" which gives new stats and access of a maximum of 2 moves from an evolutionary lines' movepool as well as the final form's abilities. If the new evolution gains a typing, primary or secondary, the cross-evolved Pokémon will get it too (or replace its old type).
Enchanted Items
Every item now has an ability attached to them, allowing Pokemon to effectively have two abilities.
Field Control
The field effect put in place is now dependant on the Pokemon's nickname.
Field Plating
If a Pokemon is holding a plate, it will trigger an effect upon switchin. For example, if a Pokemon is holding a Sky Plate Rain will trigger, and if a Pokemon is holding a Mind Plate Trick Room will trigger.
Final Breath
Pokemon will only faint at the end of a turn, even if their HP is at 0.
Forecast
A weather based metagame with the idea that there is a set weather pattern throughout the match, switching after every three turns. The pattern is fixed, so players can predict plays accordingly.
Gendermons
Male Pokemon received a 1.2x boost to Attack and Defense and a .8x reduction to Special Attack and Special Defense. Female Pokemon receive a 1.2x boost to Special Attack and Special Defense and a .8x reduction to Attack and Defense. Genderless Pokemon are unaffacted.
Genmons
Pokemon learn all moves that were introduced in the same generation as it and only those moves. For example, Keldeo can learn Quiver Dance, a Gen 5 move but it can no longer learn Surf, a Gen 1 move.
Gods Among Us
Gods Among Us is a metagame where all Uber Pokemon are nerfed and introduced into OU.
Happy Harvest
All Pokemon gain Harvest as a hard-coded ability. For example, Celebi will have both Natural Cure and Harvest.
Hawluchange
All Pokemon receive a "Flying Press-like" move that corresponds to the Pokemon's primary typing.
Item Flip
Most items now have a flipped effect, such as an Assault Vest now boosting Defense by 1.5x, but the Pokemon can only use status moves.
Laws of Attraction
Pokemon are now able to trap Pokemon that correspond to their primary typing.
League of the Phoenix
League of the Phoenix creates a tally system which determines when a person loses. Check thread for more information.
Legal Mons
All Pokemon can have any formerly "illegal" move combinations, for instance Nidoking can now use Sheer Force and Lovely Kiss because Lovely Kiss was learned in Gen 2.
Little Cup Legends
All Legendaries receive a Little Cup match. This is a LC metagame with Ubers in it!
Lockdown
A metagame where the first 6 turns can often decide the outcome of the battle. Starting at Turn 6, every field effect and entry hazard are locked down meaning they cannot be gotten rid of. Reflect, Light Screen, Safeguard, Tailwind and Heal Block are unaffected.
MegaLess
No Mega Pokemon are able to be used.
Mega Mania
All Pokemon receive Megas with static increases. See thread for more information.
META MAN
A metagame that takes inspiration from the
Mega Man series. Each KO a Pokemon scores nets them the opponent's ability and the last used move by the opponent, the latter of which they can be kept until said Pokemon is OHKOed.
Metamons
All Pokemon work off of the mechanics of the Generation they were introduced.
Mirror Move
Two of your Pokemon's moves are chosen in the teambuilder while the other two moves are copied from the opponent's moves. Imprison is banned.
Mood Swings
Natures either increase or decrease by 50%, versus the usual 10%.
Nature's Blessing
Pokemon receive an immunity based on the type resisting Berry they hold.
Negative Metagame
Stats are recalculated with a new formula [(New Stat)=150-(Old Stat)] and floored at 5. For example, Keldeo's new Special Attack is 21 (150-129). Smeargle, Huge/Pure Power, Light Ball, Thick Club, DeepSeaTooth/Scale, and Eviolite are banned.
No Ability Metagame
All abilities are removed so Pokemon must rely only on their stats and typing. Slaking and Regigigas are banned.
No Legends Pls
All "legendary" Pokemon (usually defined as only one existing per game, but not always) are banned. Blaziken, Kangaskhanite, Gengarite, and Lucarionite are still banned.
Noobmons
Types that are super effective against another type are now always inversely resisted. For example, since Electric is super effective against Water, it now resists Water. Old resists that aren't tied to super-effectiveness (e.g. Normal vs Rock) are removed.
Normal Balance
Normal-type effectiveness is re-worked, so their STAB is super-effective against Dragon and Fairy, and they resist Dragon and Fairy; they're weak to Psychic and Poison; and their attacks are not very effective versus Poison.
Offensification
The Pokemon's highest attack stat determines if their moves are physical or special. For example, if you invest in Keldeo's Special Attack to make it the highest (between Attack and Special Attack), all its attacks will be special.
Oraclemons
Each attacking move has a "Doom Desire / Future Sight" effect where they attack hits 2 turns later.
Partners in Crime
A metagame based on Doubles OU, but with a twist! The concept was that you "share" your moves and abilities with your partner. This means that you can use your partners moves (aka, eight moves will show up in the selection screen) and its abilities.
Passive Aggressive
All type-based passive damage, such as Leech Seed and the Burn status now deals damage based on the type chart.
Peakmons
All moves, abilities, and stats revert to or stay at their "peaks". For example, Blizzard had 90% accuracy in RBY, so now it will again.
Physical Special Swap
Physical moves become special and special moves become physical. Attacks that lower stats change to correspond with the new mechanics as well (Leaf Storm lowers Attack 2 stages.)
Poison
Poison is a metagame where Poisoning your opponents halves their Special Attack, similar to how burns half Attack.
Priority Cup
All moves with a base power of 40 or less gain priority. Moves already with priority are unaffected.
RBY 6.0
Everything is reverted back to Gen 1's mechanics and types (so for ex. no Dark-, Steel-, or Fairy-type moves and Pokemon).
Recoilmons
A new formula is created where every move inflicts recoil. Click thread for specific details.
Reduced Hax OU
Certain mechanics are tweaked in an attempt to take luck down a notch without killing it completely.
Santa Showdown
The theme of this metagame is that no move actually has a set base power, it is determined by luck of the draw. Every time you or your opponent picks a move it is subject to randomization which produces an outcome. The type of the move will be determined by the original move it was supposed to be so Tackle would be Normal-type and Flare Blitz would be Fire-type.
Setupmons
All Pokemon gain access to any stat boosting move that only increases two stats maximum, like Swords Dance or Dragon Dance.
Sketchmons
Give Sketch once to every Pokemon, which allows them to learn any move to fill that single slot.
Slotmons
In this metagame, every team slot (1-6) has its own stat boosts and reductions (2 each) that activate upon switch-in.
Slowmons
Trick Room is in permanent effect so what used to be very slow is now very fast.
Smogon Triples
Send three Pokemon out to battle at a time against your opponent's three. You each still have a full team of six. The banlist and clauses are OU-based with a few differences. Dark Void, Mewtwo, Lugia, Ho-oh, Kyogre, Groudon, Rayquaza, Dialga, Palkia, Giratina, Giratina-O, Arceus, Reshiram, Zekrom, Kyurem-W, Xerneas, and Yveltal are banned.
Something Borrowed
Something Borrowed is a metagame in which each Pokemon borrows one move from each teammate adjacent to it in the team lineup to occupy its 3rd and 4th moveslots.
Spe-Neutrality
Priority brackets are entirely removed, and everything is reliant on Speed.
STABmons+
STABmons+ is a spin off of STABmons with less limitations and an Ubers environment.
Stat Preference
Shiny Pokemon's Attacks swap with Special Attack, and their Defense swaps with Special Defense. Non-shiny Pokemon stay the same.
Stat Split
A metagame in which your Pokemon has equal stats to each other. The catch is that it is decided by the average of each of your Pokemons base stats.
Status Hazard
Targeted status moves such as Fake Tears and Memento can become entry hazards if put in the first two moveslots.
StereoType
The stats of every Pokemon are averaged together, so every pure Fire-type now has the same stat allocation. Dual-typed Pokemon are an average of their two respective types, so a Fire/Flying Pokemon is an average of Fire and Flying (which are averages of all Fire and all Flying types). Eviolite, Pure/Huge Power, Light Ball, DeepSeaTooth, DeepSeaScale, and Thick Club are banned.
Stockpiling
Stockpile is added to non-damaging moves, and it is removed when used by an attack; however, the attack will be boosted depending on the Stockpile counter.
Suicide Cup Doubles
Based on Doubles, the goal is to KO your own team before the opponent. All attacks besides a typeless Dragon Rage and some support moves are banned along with Shedinja, the Alakazam line, Sigilyph, and Reuniclus.
Team Movepools
Pokemon share moves with each other in pairs on the same team. For example, if Keldeo and Thundurus are in slots 1 and 2, they can borrow from each others movepool, but not from anything else on the team. The pairs are 1 & 2, 3 & 4, and 5 & 6.
Therianmons
Every Pokemon can gain a Therian boost based on their IV spread (HP Ground for Landorus-Therian, HP Electric for Thundurus-Therian, and HP Flying for Torandus-Therian).
The Power Within
All Pokemon are able to run any move that they would like to as long as the move's type is the same as the Pokemon's Hidden Power type.
Tier 10
Pokemon must be obtainable by level 10. They can only have moves they learn via level up, breeding, and move re-learning.
Top Percentage
A metagame that changes the way a player wins. Instead of OHKOing all 6 of the opponent's Pokemon, a player must deal 400% damage to the opposing team.
Tormenting Spirits
Torment is put in place as a field effect every time a Pokemon switches into battle.
Trademarked™
A Pokemon's ability is now replaced by a status move that is within the Pokemon's movepool, activating upon switch-in.
Turnmons
1-5 turns in a battle must be only status moves, but 6-10 are only attacking, and they switch as the battle progresses.
Type Bridge
Pokemon that share the same type can now share moves. For example, since Keldeo and Poliwrath have both Fighting and Water types, they can borrow from each other's movepool so now Keldeo can learn Ice Beam and Psychic.
Type CondensinG (TCG)
The 18 currently available types are condensed into the 11 types that are in the Pokemon Trading Card Game.
Type Control
Change the type of your Pokemon simply by nicknaming them. For example, if you want Keldeo to be Flying and Fighting, change its name to 'Flying/Fighting' on the simulator.
Type Cycle
Every type shifts to the right based on a chart shown in the thread's OP. This affects everything including moves, abilities, and Pokemon's typing.
Type Exchange
Type Exchange is a metagame where the typing of one Pokemon transfers over to the next Pokemon in the party. For example, if your first Pokemon is Manaphy, your second one is Hydreigon, and your third one is Charizard, Hydreigon is now Water-type and Charizard is now Dark/Dragon-type. Manaphy will be the type of the last Pokemon in the party.
Typemons
Chose one type besides Normal and now your whole team has access to every move of that type.
Type OMlette
Type OMlette is a metagame in which a Pokemon's egg group is used to partially determine it's type.
Type Splice
Pokemon are classified by type. Every type costs as much as the amount of Pokemon it has in the National Pokedex in percentages. You can't go past 25% with the types you'll use.
Weightmons
Every Pokemon will receive a power boost in accordance to their weight.
Zero Sum Meta
A metagame where all damage you take your opponent also recovers and all health your opponent recovers you take.