Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 8 Atk / 252 Def  
Relaxed Nature  
IVs: 30 Atk / 0 Spe  
- Transform  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 252 HP / 188 Def / 64 SpD / 4 Spe  
Impish Nature  
- Stealth Rock  
- Toxic  
- Morning Sun  
- Sunsteel Strike  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
EVs: 248 HP / 200 Def / 52 SpD / 8 Spe  
Careful Nature  
- Protect  
- Sacred Fire  
- Whirlwind  
- Defog  

Arceus-Ground @ Earth Plate  
Ability: Multitype  
EVs: 248 HP / 136 Def / 124 Spe  
Bold Nature  
IVs: 0 Atk  
- Recover  
- Judgment  
- Ice Beam  
- Refresh  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 208 HP / 252 SpD / 48 Spe  
Calm Nature  
IVs: 0 Atk  
- Toxic Spikes  
- Sludge Bomb  
- Flamethrower  
- Recover  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 252 SpA / 4 SpD / 252 Spe  
Hasty Nature  
- Rest  
- Eruption  
- Precipice Blades  
- Stone Edge