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

Calyrex-Shadow @ Leftovers  
Ability: As One (Spectrier)  
EVs: 208 HP / 48 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Nasty Plot  
- Astral Barrage  
- Baton Pass  
- Substitute  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Stealth Rock  
- Sunsteel Strike  
- Earthquake  
- Morning Sun  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
IVs: 28 Spe  
- Knock Off  
- U-turn  
- Defog  
- Roost  

Eternatus @ Expert Belt  
Ability: Pressure  
EVs: 152 SpA / 220 SpD / 136 Spe  
Modest Nature  
IVs: 0 Atk  
- Draco Meteor  
- Flamethrower  
- Sludge Bomb  
- Recover  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 228 Def / 252 SpA / 28 Spe  
Modest Nature  
- Geomancy  
- Moonblast  
- Thunder  
- Substitute