Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 4 Def  
Adamant Nature  
- Water Shuriken  
- Pursuit  
- Sucker Punch  
- Gastro Acid  

Gyarados-Mega @ Choice Band  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 4 SpD  
Brave Nature  
IVs: 0 Spe  
- Water Shuriken  
- Pursuit  
- Trick  
- Gastro Acid  

Diancie-Mega @ Focus Sash  
Ability: Pixilate  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naughty Nature  
- Fake Out  
- Extreme Speed  
- Boomburst  
- Stealth Rock  

Rayquaza-Mega @ Sky Plate  
Ability: Mold Breaker  
EVs: 64 HP / 252 SpA / 192 Spe  
Modest Nature  
- Dark Void  
- Shell Smash  
- Substitute  
- Oblivion Wing  

Kyogre-Primal @ Leftovers  
Ability: Wonder Guard  
EVs: 104 HP / 4 Def / 252 SpA / 148 Spe  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- Shell Smash  
- Baton Pass  
- Substitute  

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