I've been able to make a great core out of Bisharp, Slowbro, Zygarde 10%, and Tornadus. It was made originally to mainly counter the threat of Keldeo, but after play a few games with it, I've realized how strong it could be. Note that this is still very early in the UU Alpha stage, nor am I that good of a player. <:)
Bisharp @ Life Orb
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Pursuit
- Sucker Punch
- Iron Head
- Knock Off/ Low Kick/ Swords Dance
------------------------------
Slowbro @ Leftovers
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Thunder Wave
- Psyshock
- Scald
- Slack Off
Alternatively:
Slowbro-Mega @ Slowbronite
Ability: Shell Armor
EVs: 252 HP / 80 Def / 176 SpD
Bold Nature
IVs: 0 Atk
- Calm Mind
- Psyshock /Ice Beam
- Scald
- Slack Off / Iron Defense
------------------------------
Zygarde-10% @ Choice Band
Ability: Aura Break
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Thousand Arrows
- Outrage
- Superpower
- Extremespeed
------------------------------
Tornadus-Therian (M) @ Assault Vest
Ability: Regenerator
EVs: 96 HP / 160 SpA / 252 Spe
Hasty Nature
- U-turn
- Heat Wave / Focus Blast / Superpower
- Hurricane
- Knock Off
Together, they cover a lot of weaknesses of each other. Bisharp makes use of a pursuit trapping as pressure, but works well by taking care of fairy types so that there's no harm in using Outrage on Zygarde 10% The trapping puts a check on a lot of fast mons like Lati@s, Gengar, Alakazam, and even Raikou. It makes for a great check to most fairies and a great trapper, but can sometimes get out-classed by Weavile in speed, which might be a good idea if you can't find a way to make use of Bisharp as I did. Both pokemon, however, are almost completely blocked by Keldeo and a few other pokemon, and need help taking care of them with the rest of the core.
That's where Slowbro comes in. Slowbro is almost a complete check to Keldeo, or any fast sweeper for that matter. Slowbro being able to use thunder wave to slow any sweep is godly, and it might even get the niche in the battle. Alternatively however, you could use up your mega slot and take Mega Slowbro in for a ride. Psyshock is great for dealing with pokemon like Conkeldurr. The use of Ice beam after a few Calm minds is perfect for surprising a Dragonite, as well. The physical bulk allows to tank at least one hit, and it's 2 different ways of regaining health make it something that is not easily dealt with.
Next, Zydoge. One of the best revenge sweepers, and perfect for out-speeding a lot of pokemon. if Garchomp and Entei had a baby, it would be this. Fantastic speed as well as one of most difficult moves to counter as a flying type, Thousand's Arrows. With Mamoswine gone, this pokemon is getting it's chance to shine, and utilizing probably the most pressuring ground move, as well as Extremespeed, it could end up being a huge threat in UU, especially with a core like this. Clear our fairy types and it's free to wreck havoc with outrage.
Lastly, Tornadus-T works as a sort of pivot utility in the core. It's great speed allows to take care of certain pokemon, but Regenerator makes it difficult to kill off. After usually living a hit, knocking off a choice item in battle usually means a lot, and being able to u-turn to regain health makes it super annoying. Hurricane takes care of Keldeo, but Heat Wave/ Focus Blast are meant to hit any scizor or other annoying steel types. It's surprisingly useful, with the SpD it gets from AV, it can take a lot more than meets the eye.
Counters: I wanted to leave a little section here for things to look out for as well as take note of if you ever try this core out. Azumarill and Gyarados are the main ones I can think of as of now, considering they both don't require speed to sweep and counter a great deal of pokemon in this core. Maybe slap on a surprise Focus Breloom, Zapdos, or even Raikou to clear those out as much as possible.
Thanks for reading through this. I'm still new to the Smogon community, and I'm trying my best to get involved currently. If I posted this in the wrong thread, just let me know and I'll move as soon as possible. Thanks again.