Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
Shiny: Yes  
EVs: 248 HP / 200 Def / 40 SpD / 20 Spe  
Careful Nature  
- Sacred Fire  
- Brave Bird  
- Defog  
- Thunder Wave  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 112 HP / 144 Def / 252 Spe  
Jolly Nature  
- Knock Off  
- Foul Play  
- Taunt  
- Roost  

Groudon @ Leftovers  
Ability: Drought  
EVs: 252 HP / 128 Atk / 100 Def / 28 Spe  
Impish Nature  
- Stealth Rock  
- Precipice Blades  
- Stone Edge  
- Toxic  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 220 Def / 36 Spe  
Impish Nature  
- Dragon Dance  
- Sunsteel Strike  
- Knock Off  
- Moonlight  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 236 HP / 140 SpD / 132 Spe  
Timid Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Mystical Fire  
- Toxic  
- Recover  

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