Charizard-Mega-X @ Charizardite X  
Ability: Tough Claws  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Flare Blitz  
- Earthquake  
- Dragon Claw / Substitute

Serperior @ Rocky Helmet  
Ability: Contrary  
EVs: 40 HP / 216 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Leaf Storm  
- Glare  
- Taunt  
- Defog  

Volcarona @ Iapapa Berry  
Ability: Flame Body  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Quiver Dance  
- Fire Blast  
- Bug Buzz  
- Hidden Power [Ground] / Giga Drain

Kommo-o @ Kommonium Z  
Ability: Bulletproof  
EVs: 4 Atk / 252 SpA / 252 Spe  
Hasty Nature  
- Clanging Scales  
- Flamethrower  
- Close Combat / Drain Punch
- Taunt  

Magearna @ Leftovers  
Ability: Soul-Heart  
EVs: 248 HP / 28 Def / 224 SpA / 8 SpD  
Modest Nature  
IVs: 0 Atk  
- Calm Mind  
- Thunderbolt  
- Ice Beam  
- Aura Sphere

Mew @ Focus Sash  
Ability: Synchronize  
EVs: 252 Atk / 4 Def / 252 Spe
Jolly / Timid Nature  
- Stealth Rock  
- Taunt  
- Thunder Wave  
- Explosion / Ice Beam