Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
EVs: 252 HP / 216 Def / 40 Spe  
Impish Nature  
- Dragon Dance  
- Sunsteel Strike  
- Morning Sun  
- Earthquake  

Ferrothorn @ Leftovers  
Ability: Iron Barbs  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
- Stealth Rock  
- Leech Seed  
- Thunder Wave  
- Power Whip  

Eternatus @ Life Orb  
Ability: Pressure  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Recover  
- Dynamax Cannon  
- Sludge Bomb  
- Flamethrower  

Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 4 Atk / 252 Def  
Relaxed Nature  
IVs: 30 Atk / 0 Spe  
- Transform  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 20 Def / 160 SpD / 80 Spe  
Careful Nature  
- Knock Off  
- Taunt  
- Roost  
- Defog  

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