Beedrill-Mega @ Black Sludge  
Ability: No Guard  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- King's Shield  
- U-turn  
- Taunt  
- Sheer Cold  

Dialga @ Safety Goggles  
Ability: Mold Breaker  
EVs: 232 HP / 8 Def / 252 SpA / 16 Spe  
Modest Nature  
IVs: 0 Atk  
- Taunt  
- Shell Smash  
- Spacial Rend  
- Searing Shot  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Wonder Guard  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Trick  
- Close Combat  
- Knock Off  
- Diamond Storm  

Arceus @ Leftovers  
Ability: Wonder Guard  
EVs: 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Baton Pass  
- Boomburst  
- Taunt  

Xerneas @ Shed Shell  
Ability: Magic Bounce  
EVs: 248 HP / 252 Def / 8 SpA  
Bold Nature  
IVs: 0 Atk  
- Roost  
- Moonblast  
- Baton Pass  
- Quiver Dance  

Chansey (F) @ Eviolite  
Ability: Imposter  
EVs: 248 HP / 8 Def / 252 SpD  
Sassy Nature  
IVs: 30 SpA / 0 Spe  
- Dragon Tail  
- Sleep Talk  
- Spikes  
- Wish