Mewtwo-Mega-X @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 84 Def / 172 Spe  
Naughty Nature  
- Ice Punch  
- Low Kick  
- Beat Up  
- Surf  

Groudon-Primal @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Thousand Arrows  
- Trick  
- Taunt  
- Perish Song  

Rayquaza-Mega @ Sky Plate  
Ability: Mold Breaker  
EVs: 64 HP / 252 SpA / 192 Spe  
Modest Nature  
IVs: 0 Atk  
- Quiver Dance  
- Oblivion Wing  
- Earth Power  
- Glare  

Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 248 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Ice Shard  
- Pursuit  
- Beat Up  
- Gunk Shot  

Blissey (F) @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Whirlwind  
- Parting Shot  
- Defog  
- Roost  

Audino-Mega @ Safety Goggles  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Stealth Rock  
- U-turn  
- Roost  
- Aromatherapy