Groudon @ Lum Berry  
Ability: Drought  
EVs: 140 HP / 252 Atk / 116 Spe  
Adamant Nature  
- Rock Polish  
- Precipice Blades  
- Stone Edge  
- Swords Dance  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 72 HP / 144 Def / 248 SpA / 44 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Psyshock  
- Aromatherapy  

Yveltal @ Black Glasses  
Ability: Dark Aura  
EVs: 248 HP / 208 Atk / 52 SpD  
Adamant Nature  
- Knock Off  
- Sucker Punch  
- Roost  
- U-turn  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 100 Def / 124 SpD / 32 Spe  
Impish Nature  
IVs: 0 Spe  
- Stealth Rock  
- Sunsteel Strike  
- Moonlight  
- Thunder Wave  

Marshadow @ Life Orb  
Ability: Technician  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Close Combat  
- Poltergeist  
- Shadow Sneak  
- Ice Punch  

Eternatus @ Life Orb  
Ability: Pressure  
EVs: 136 HP / 216 SpA / 20 SpD / 136 Spe  
Modest Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Flamethrower  
- Sludge Bomb  
- Recover