Groudon @ Heat Rock  
Ability: Drought  
EVs: 252 HP / 228 Def / 28 SpD  
Impish Nature  
- Earthquake  
- Stealth Rock  
- Thunder Wave  
- Roar  

Ho-Oh @ Choice Band  
Ability: Regenerator  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Brave Bird  
- Earthquake  
- Flare Blitz  
- Defog  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 236 HP / 252 SpD / 20 Spe  
Calm Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Flamethrower  
- Sludge Wave  
- Recover  

Necrozma-Dusk-Mane @ Heavy-Duty Boots  
Ability: Prism Armor  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Stone Edge  
- Morning Sun  
- Thunder Wave  
- Sunsteel Strike  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
- Defog  
- Snarl  
- U-turn  
- Roost  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Play Rough  
- Solar Blade  
- Close Combat  
- Wild Charge