Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Insomnia  
EVs: 40 Def / 216 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Ice Beam  
- Fire Blast  
- Calm Mind  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 168 Def / 252 SpA / 88 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Thunder  
- Focus Blast  

Arceus-Fairy @ Pixie Plate  
Ability: Multitype  
EVs: 252 HP / 168 Def / 88 Spe  
Timid Nature  
IVs: 0 Atk  
- Toxic  
- Will-O-Wisp  
- Recover  
- Refresh  

Skarmory @ Shed Shell  
Ability: Sturdy  
EVs: 252 HP / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Roost  
- Whirlwind  
- Spikes  
- Toxic  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 252 HP / 56 Def / 180 SpD / 20 Spe  
Impish Nature  
- Stealth Rock  
- Precipice Blades  
- Overheat  
- Toxic  

Giratina-Origin @ Griseous Orb  
Ability: Levitate  
EVs: 248 HP / 208 SpA / 52 SpD  
Modest Nature  
IVs: 0 Atk  
- Defog  
- Hex  
- Dragon Pulse  
- Thunder Wave