Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
- Geomancy  
- Moonblast  
- Thunder  
- Substitute

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 48 HP / 164 Def / 252 SpA / 44 Spe
Modest Nature
- Geomancy
- Moonblast
- Thunder
- Substitute

Xerneas @ Leftovers
Ability: Fairy Aura
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Moonblast
- Rest / Roar
- Thunder Wave / Toxic
- Aromatherapy / Defog