Groudon @ Lum Berry  
Ability: Drought  
EVs: 100 HP / 252 Atk / 156 Spe  
Adamant Nature  
- Rock Polish  
- Swords Dance  
- Precipice Blades  
- Stone Edge  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 252 HP / 28 Atk / 116 Def / 112 Spe  
Adamant Nature  
- Fire Fang  
- Behemoth Blade  
- Close Combat  
- Wild Charge  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 252 HP / 220 Def / 36 Spe  
Impish Nature  
- Stealth Rock  
- Thunder Wave  
- Iron Head  
- Morning Sun  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 64 HP / 192 SpD / 252 Spe  
Jolly Nature  
IVs: 0 Atk  
- Foul Play  
- Taunt  
- Roost  
- Defog  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 252 HP / 156 SpD / 100 Spe  
Timid Nature  
IVs: 0 Atk  
- Sludge Bomb  
- Dynamax Cannon  
- Flamethrower  
- Recover  

Marshadow @ Choice Band  
Ability: Technician  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Spectral Thief  
- Close Combat  
- Shadow Sneak  
- Ice Punch