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

Groudon @ Leftovers  
Ability: Drought  
EVs: 252 HP / 240 Def / 16 Spe  
Impish Nature  
- Precipice Blades  
- Toxic  
- Stealth Rock  
- Stone Edge  

Marshadow @ Life Orb  
Ability: Technician  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Spectral Thief  
- Low Kick  
- Ice Punch  
- Shadow Sneak  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 136 HP / 252 SpD / 120 Spe  
Careful Nature  
- Sunsteel Strike  
- Knock Off  
- Dragon Dance  
- Moonlight  

Eternatus @ Shuca Berry  
Ability: Pressure  
EVs: 40 HP / 252 SpD / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Mystical Fire  
- Toxic  
- Recover  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 16 HP / 240 SpD / 252 Spe  
Timid Nature  
- Knock Off  
- U-turn  
- Defog  
- Roost