Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Transform  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
IVs: 24 Spe  
- U-turn  
- Foul Play  
- Roost  
- Defog  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 248 HP / 244 Def / 16 Spe  
Impish Nature  
- Morning Sun  
- Stealth Rock  
- Earthquake  
- Sunsteel Strike  

Kyurem-White @ Utility Umbrella  
Ability: Turboblaze  
EVs: 40 SpA / 216 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Freeze-Dry  
- Fusion Flare  
- Roost  

Calyrex-Shadow @ Life Orb  
Ability: As One (Spectrier)  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Nasty Plot  
- Astral Barrage  
- Draining Kiss  

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