Mewtwo-Mega-Y @ Shed Shell  
Ability: Protean  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Secret Sword  
- Grass Knot  
- Sludge Bomb  
- Moonblast  

Groudon-Primal @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- V-create  
- Thousand Arrows  
- Trick  
- Spikes  

Rayquaza-Mega @ Choice Band  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Ascent  
- Precipice Blades  
- Trick  
- U-turn  

Arceus-Ghost @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 44 Def / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Chatter  
- Gastro Acid  
- Baton Pass  

Scizor-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Recover  
- U-turn  
- Whirlwind  
- Defog  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Spore  
- Curse  
- Roost  
- Encore