Groudon @ Leftovers  
Ability: Drought  
EVs: 248 HP / 72 Atk / 108 Def / 80 Spe  
Impish Nature  
- Stealth Rock  
- Precipice Blades  
- Stone Edge  
- Toxic  

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

Pheromosa @ Choice Band  
Ability: Beast Boost  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- U-turn  
- Close Combat  
- Foul Play  
- Triple Axel  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 224 SpD / 32 Spe  
Careful Nature  
- Thunder Wave  
- Iron Head  
- Moonlight  
- Knock Off  

Eternatus @ Eject Pack  
Ability: Pressure  
EVs: 252 HP / 40 SpD / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Recover  
- Flamethrower  
- Sludge Bomb  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 72 HP / 252 SpD / 184 Spe  
Jolly Nature  
- U-turn  
- Knock Off  
- Roost  
- Defog