TAPU KOKO (TAPU BULU) - Tapu Koko will help check Greninja. Tapu Bulu isn't the greatest choiced user, so use Tapu Koko instead, who fits the role perfectly. Here's a set blatantly stolen from smogon (boring, I know, but very effective)
Tapu Koko @ Choice Specs
Ability: Electric Terrain
Shiny: Yes
Timid Nature
EVs; 252 Spe/252 SpA/4 SpD
IVs: 0 Atk
- Thunderbolt
- Volt Switch
- Hidden Power [Ice]
- Dazzling Gleam
TYRANITAR-MEGA - I don't really have a problem with your set, more of this pokemon as whole, but I won't address that now because I already changed one of your pokemon, and this one is one of your main sweepers.
VICTINI - Final Gambit is a total waste on a Victini with no HP EVs. Besides, Stealth Rock takes off a hefty 25% of Victini's HP, making it not the greatest at being a Final Gambit user. Use Hidden Power [Ice] instead, to help against Ground Types, especially Garchomp, Landorus-T, and Zygarde. They won't be expecting a scarfed special Victini, so they might even try setting up on you, only to get a nasty suprise.
LANDORUS-T - Bulk Up Landorus-T is unviable in every way possible. Having a Stealth Rock user with Ground STAB and Knock Off would be nice though, so I'll just suggest a new moveset. Here it is:
Landorus-T @ Rocky Helmet
Ability: Intimidate
Adamant Nature
EVs: 252 Atk/172 HP/84 Spe
- Earthquake
- Knock Off
- Stealth Rock
- Defog
KYUREM-BLACK - Black Kyurem isn’t tanky enough to survive a super effective hit. Because of this, replace his Weakness Policy for a Life Orb. It’s more important that Black Kyurem outspeed things than do damage, especially because he has a Special Defense lowering nature. So, get rid of Naughty, and use Naive instead. Outrage isn’t that good in OU because of Fairy Types. (Especially Clefable and Mimikyu, who can set up on you.) Use Roost instead, for recovery. Like I said before, it’s more important that Black Kyurem outspeed things than to do a certain amount of damage. Try adjusting its EV layout to suit this. My recommendation is 252 Spe/252 SpA/4 Atk, but it’s important to expirement and see what fits your team best.
HOOPA-U - Your Hoopa Unbound is fine.
