Mewtwo-Mega-X @ Mewtwonite X  
Ability: Steadfast  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Aura Sphere  
- Energy Ball  
- Psychic  
- Calm Mind  

Blacephalon @ Choice Band  
Ability: Beast Boost  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Explosion  
- Flame Charge  
- Shadow Claw  
- Knock Off  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 252 HP / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Eruption  
- Earth Power  
- Rest  
- Sleep Talk  

Zekrom @ Assault Vest  
Ability: Teravolt  
EVs: 4 HP / 252 Def / 252 SpA  
Bold Nature  
IVs: 0 Atk  
- Draco Meteor  
- Thunderbolt  
- Volt Switch  
- Earth Power  

Xerneas @ Leftovers  
Ability: Fairy Aura  
EVs: 252 HP / 4 Atk / 252 SpD  
Careful Nature  
- Aromatherapy  
- Close Combat  
- Thunder Wave  
- Defog  

Pheromosa @ Choice Specs  
Ability: Beast Boost  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
- Bug Buzz  
- Focus Blast  
- Ice Beam  
- U-turn