Diancie-Mega @ Focus Sash  
Ability: Magic Bounce  
EVs: 28 Atk / 228 SpA / 252 Spe  
Hasty Nature  
- Stealth Rock  
- Endeavor  
- Moonblast  
- Diamond Storm  

Mewtwo-Mega-Y @ Expert Belt  
Ability: Insomnia  
EVs: 88 Def / 204 SpA / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Calm Mind  
- Psystrike  
- Focus Blast  
- Ice Beam  

Zygarde-Complete @ Groundium Z  
Ability: Power Construct  
EVs: 24 HP / 252 Atk / 232 Spe  
Adamant Nature  
- Dragon Dance  
- Substitute  
- Thousand Arrows  
- Dragon Tail  

Groudon-Primal @ Shuca Berry  
Ability: Desolate Land  
EVs: 252 SpA / 100 SpD / 156 Spe  
Mild Nature  
- Rock Polish  
- Fire Blast  
- Precipice Blades  
- Hidden Power [Ice]  

Arceus @ Chople Berry  
Ability: Multitype  
EVs: 240 HP / 252 Atk / 16 Spe  
Adamant Nature  
- Swords Dance  
- Extreme Speed  
- Shadow Claw  
- Recover  

Salamence-Mega @ Sharp Beak  
Ability: Aerilate  
Happiness: 0  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Double-Edge  
- Roost  
- Facade