Dialga @ Shuca Berry  
Ability: Pressure  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Stealth Rock  
- Draco Meteor  
- Flash Cannon  
- Thunder Wave  

Yveltal @ Choice Scarf  
Ability: Dark Aura  
EVs: 184 HP / 248 Atk / 72 Spe  
Modest Nature  
- Dark Pulse  
- Oblivion Wing  
- Foul Play  
- U-turn  

Marshadow @ Marshadium Z  
Ability: Technician  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naive Nature  
- Spectral Thief  
- Close Combat  
- Substitute  
- Bulk Up  

Groudon @ Red Orb  
Ability: Drought  
EVs: 48 Atk / 252 SpA / 144 SpD / 64 Spe  
Mild Nature  
- Rock Polish  
- Fire Blast  
- Precipice Blades  
- Hidden Power [Ice]  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 72 HP / 252 SpA / 100 SpD / 84 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Thunder  
- Focus Blast  

Arceus @ Chople Berry  
Ability: Multitype  
EVs: 184 HP / 252 Atk / 72 Spe  
Adamant Nature  
- Swords Dance  
- Extreme Speed  
- Shadow Claw  
- Recover