Mewtwo @ Light Clay  
Ability: Unnerve  
EVs: 248 HP / 8 Atk / 252 Spe  
Jolly Nature  
- Reflect  
- Light Screen  
- Taunt  
- Self-Destruct  

Grimmsnarl (M) @ Light Clay  
Ability: Prankster  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Play Rough  
- Light Screen  
- Reflect  
- Taunt  

Magearna @ Weakness Policy  
Ability: Soul-Heart  
EVs: 252 HP / 252 SpA / 4 SpD  
Modest Nature  
IVs: 0 Atk  
- Calm Mind  
- Iron Defense  
- Stored Power  
- Draining Kiss  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 168 Def / 252 SpA / 88 Spe  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- Geomancy  
- Thunder  
- Psyshock  

Calyrex-Shadow @ Focus Sash  
Ability: As One (Spectrier)  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Astral Barrage  
- Nasty Plot  
- Psyshock  
- Draining Kiss  

Zekrom @ Weakness Policy  
Ability: Teravolt  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naughty Nature  
- Bolt Strike  
- Dragon Dance  
- Draco Meteor  
- Substitute