Groudon @ Life Orb  
Ability: Drought  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Swords Dance  
- Precipice Blades  
- Stone Edge  
- Aerial Ace  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
EVs: 248 HP / 208 Def / 52 SpD  
Impish Nature  
- Sacred Fire  
- Toxic  
- Defog  
- Whirlwind  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Behemoth Blade  
- Wild Charge  
- Close Combat  
- Assurance  

Yveltal @ Life Orb  
Ability: Dark Aura  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Knock Off  
- Dual Wingbeat  
- Sucker Punch  
- Roost  

Eternatus @ Heavy-Duty Boots  
Ability: Pressure  
EVs: 252 HP / 160 SpD / 96 Spe  
Timid Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Flamethrower  
- Recover  
- Toxic  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 248 HP / 252 Def / 8 Spe  
Impish Nature  
- Morning Sun  
- Stealth Rock  
- Earthquake  
- Sunsteel Strike