Groudon @ Leftovers  
Ability: Drought  
EVs: 252 HP / 116 Atk / 80 Def / 60 Spe  
Adamant Nature  
- Precipice Blades  
- Swords Dance  
- Stone Edge  
- Stealth Rock  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
EVs: 252 HP / 204 Def / 52 SpD  
Impish Nature  
- Sacred Fire  
- Toxic  
- Defog  
- Roost  

Lunala @ Heavy-Duty Boots  
Ability: Shadow Shield  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Calm Mind  
- Moongeist Beam  
- Psyshock  
- Roost  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 48 HP / 172 Def / 252 SpA / 36 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Thunder  
- Substitute  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 4 Atk / 252 Def  
Relaxed Nature  
- Stealth Rock  
- Sunsteel Strike  
- Photon Geyser  
- Morning Sun  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 188 Def / 72 SpD  
Impish Nature  
- Foul Play  
- U-turn  
- Roost  
- Defog