Reshiram @ Haban Berry  
Ability: Turboblaze  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Flare Blitz  
- Dragon Claw  
- Roost  

Groudon @ Heat Rock  
Ability: Drought  
EVs: 252 HP / 100 Def / 156 Spe  
Impish Nature  
- Precipice Blades  
- Stone Edge  
- Swords Dance  
- Stealth Rock  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
IVs: 30 Spe  
- Sunsteel Strike  
- Morning Sun  
- Earthquake  
- Trick Room  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
IVs: 0 Atk  
- Roost  
- Foul Play  
- Defog  
- Taunt  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 252 HP / 212 SpD / 44 Spe  
Calm Nature  
IVs: 0 Atk  
- Sludge Bomb  
- Flamethrower  
- Dynamax Cannon  
- Recover  

Xerneas @ Choice Scarf  
Ability: Fairy Aura  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moonblast  
- Thunder  
- Grass Knot  
- Thunder Wave