Keldeo + Volcarona to destroy the OU meta

Keldeo-Resolute @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Secret Sword
- Hidden Power [Poison]
- Focus Blast

Tyranitar-Mega @ Tyranitarite
Ability: Sand Stream
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stone Edge
- Pursuit
- Stealth Rock
- Ice Punch

Tapu Bulu @ Leftovers
Ability: Grassy Surge
EVs: 104 HP / 252 Atk / 4 Def / 148 Spe
Adamant Nature
- Horn Leech
- Bulk Up
- Superpower
- Stone Edge

Tornadus-Therian @ Rocky Helmet
Ability: Regenerator
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Hurricane
- U-turn
- Knock Off
- Defog

Volcarona @ Buginium Z
Ability: Flame Body
Happiness: 0
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- Psychic
- Fiery Dance
- Bug Buzz

Marowak-Alola @ Thick Club
Ability: Lightning Rod
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Flare Blitz
- Shadow Bone
- Bonemerang
- Low Kick