Mewtwo-Mega-X @ Shed Shell  
Ability: Huge Power  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Drain Punch  
- Play Rough  
- Thousand Arrows  
- Diamond Storm  

Metagross-Mega @ Choice Scarf  
Ability: Huge Power  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Gear Grind  
- Sacred Fire  
- U-turn  
- Trick  

Gyarados @ Gyaradosite  
Ability: Wonder Guard  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Shell Smash  
- Knock Off  
- Substitute  
- Magic Coat  

Xerneas @ Iron Plate  
Ability: Wonder Guard  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Judgment  
- Lava Plume
- Freeze-Dry  

Regigigas @ Safety Goggles  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Spore  
- Shell Smash / Belly Drum
- Extreme Speed  
- Thousand Arrows  

Gengar-Mega @ Spooky Plate  
Ability: Prankster  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
- Judgment  
- Copycat  
- Dark Void  
- Destiny Bond