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

Ferrothorn @ Leftovers  
Ability: Iron Barbs  
EVs: 252 HP / 8 Atk / 248 SpD  
Sassy Nature  
IVs: 0 Spe  
- Spikes  
- Leech Seed  
- Gyro Ball  
- Power Whip  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 252 HP / 72 SpD / 184 Spe  
Timid Nature  
IVs: 0 Atk  
- Foul Play  
- Roost  
- Defog  
- Taunt  

Necrozma-Dusk-Mane @ Metal Coat  
Ability: Prism Armor  
EVs: 236 HP / 240 Def / 32 Spe  
Impish Nature  
- Stealth Rock  
- Sunsteel Strike  
- Moonlight  
- Thunder Wave  

Eternatus @ Power Herb  
Ability: Pressure  
EVs: 40 Def / 252 SpA / 216 Spe  
Modest Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Flamethrower  
- Meteor Beam  
- Recover  

Calyrex-Shadow @ Choice Scarf  
Ability: As One (Spectrier)  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Astral Barrage  
- Trick  
- Aromatherapy  
- Psyshock