Necrozma-Dusk-Mane @ Colbur Berry  
Ability: Prism Armor  
EVs: 252 HP / 224 SpD / 32 Spe  
Careful Nature  
- Sunsteel Strike  
- Morning Sun  
- Stealth Rock  
- Thunder Wave  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 88 Def / 172 SpD  
Careful Nature  
- Roost  
- Knock Off  
- Sucker Punch  
- Defog  

Groudon @ Leftovers  
Ability: Drought  
EVs: 100 HP / 252 Atk / 156 Spe  
Adamant Nature  
- Swords Dance  
- Precipice Blades  
- Stone Edge  
- Heat Crash  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
EVs: 248 HP / 192 Atk / 52 SpD / 16 Spe  
Adamant Nature  
- Sacred Fire  
- Brave Bird  
- Defog  
- Thunder Wave  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 248 HP / 16 Def / 220 SpD / 24 Spe  
Timid Nature  
IVs: 0 Atk  
- Recover  
- Dynamax Cannon  
- Toxic  
- Reflect  

Calyrex-Shadow @ Choice Specs  
Ability: As One (Spectrier)  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Astral Barrage  
- Trick  
- Nasty Plot  
- Protect