Dialga @ Choice Specs  
Ability: Pressure  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
- Draco Meteor  
- Power Gem  
- Thunder  
- Fire Blast  

Groudon @ Leftovers  
Ability: Drought  
EVs: 240 HP / 252 Def / 16 Spe  
Impish Nature  
- Stealth Rock  
- Thunder Wave  
- Precipice Blades  
- Stone Edge  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 72 HP / 252 SpD / 184 Spe  
Timid Nature  
- Roost  
- Foul Play  
- Defog  
- U-turn  

Eternatus @ Heavy-Duty Boots  
Ability: Pressure  
EVs: 240 HP / 252 SpD / 16 Spe  
Timid Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Recover  
- Mystical Fire  
- Toxic  

Calyrex-Shadow @ Choice Scarf  
Ability: As One (Spectrier)  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Astral Barrage  
- Psyshock  
- Trick  
- Aromatherapy  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Sunsteel Strike  
- Morning Sun  
- Knock Off  
- Swords Dance