Groudon @ Leftovers  
Ability: Drought  
EVs: 252 HP / 236 Def / 20 Spe  
Impish Nature  
- Stealth Rock  
- Thunder Wave  
- Precipice Blades  
- Stone Edge  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 136 HP / 252 Def / 120 Spe  
Impish Nature  
- Dragon Dance  
- Sunsteel Strike  
- Earthquake  
- Morning Sun  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 72 HP / 184 SpD / 252 Spe  
Jolly Nature  
- Roost  
- Defog  
- Foul Play  
- Sucker Punch  

Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 252 HP / 156 SpD / 100 Spe  
Timid Nature  
- Toxic  
- Flamethrower  
- Dragon Tail  
- Recover  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Fire Fang  
- Play Rough  
- Close Combat  
- Wild Charge  

Ferrothorn @ Leftovers  
Ability: Iron Barbs  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
IVs: 0 Atk  
- Iron Defense  
- Body Press  
- Spikes  
- Leech Seed