Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Transform  

Salamence-Mega @ Salamencite  
Ability: Aerilate  
EVs: 56 HP / 236 Atk / 216 Spe  
Adamant Nature  
- Dragon Dance  
- Double-Edge  
- Facade  
- Roost  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 216 SpA / 92 SpD / 200 Spe  
Mild Nature  
- Stealth Rock  
- Precipice Blades  
- Overheat  
- Rock Tomb  

Arceus @ Leftovers  
Ability: Multitype  
EVs: 240 HP / 252 Atk / 16 Spe  
Adamant Nature  
- Swords Dance  
- Extreme Speed  
- Shadow Claw  
- Recover  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 104 HP / 128 Def / 232 SpA / 44 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Thunder  
- Aromatherapy  

Necrozma-Dusk-Mane @ Ultranecrozium Z  
Ability: Prism Armor  
EVs: 224 Atk / 32 Def / 252 Spe  
Jolly Nature  
- Swords Dance  
- Photon Geyser  
- Earthquake  
- Stone Edge