Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 120 HP / 252 SpA / 32 SpD / 104 Spe  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- Taunt  
- Substitute  
- Baton Pass  

Mewtwo-Mega-Y @ Shed Shell  
Ability: No Guard  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Seed Flare  
- Hurricane  
- Gastro Acid  

Groudon-Primal @ Choice Band  
Ability: Mold Breaker  
EVs: 232 HP / 252 Atk / 20 Spe  
Adamant Nature  
- Thousand Arrows  
- V-create  
- U-turn  
- Ice Shard  

Gyarados-Mega @ Shed Shell  
Ability: Huge Power  
EVs: 248 HP / 252 Atk / 8 SpD  
Adamant Nature  
- Pursuit  
- Beat Up  
- Water Shuriken  
- Ice Shard  

Aegislash @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 76 SpD / 180 Spe  
Calm Nature  
IVs: 0 Atk  
- Spikes  
- Baton Pass  
- Roost  
- Curse  

Ferrothorn @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 168 Def / 92 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Recover  
- Defog  
- Whirlwind  
- Baton Pass