Aerodactyl-Mega @ Choice Scarf  
Ability: No Guard  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
IVs: 0 Atk  
- Trick  
- Sheer Cold  
- Toxic Spikes  
- Gastro Acid  

Thundurus (M) @ Leftovers  
Ability: Wonder Guard  
EVs: 252 Def / 4 SpA / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Gastro Acid  
- Chatter  
- Taunt  
- Spikes  

Gengar-Mega @ Black Sludge  
Ability: Wonder Guard  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Baton Pass  
- Sludge Bomb  
- Taunt  

Aegislash @ Leftovers  
Ability: Magic Bounce  
EVs: 248 HP / 80 SpD / 180 Spe  
Calm Nature  
IVs: 0 Atk  
- Milk Drink  
- Substitute  
- Baton Pass  
- Curse  

Xerneas @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 4 Def / 4 SpA / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Roost  
- Defog  
- Baton Pass  
- Moonblast  

Rayquaza-Mega @ Shed Shell  
Ability: Mold Breaker  
EVs: 208 HP / 252 SpA / 48 Spe  
Modest Nature  
IVs: 0 Atk  
- Quiver Dance  
- Taunt  
- Oblivion Wing  
- Earth Power