Mewtwo-Mega-X @ Life Orb  
Ability: Huge Power  
EVs: 248 HP / 252 Atk / 8 Spe  
Adamant Nature  
- Shadow Sneak  
- Mach Punch  
- Water Shuriken  
- Poison Jab  

Regigigas @ Silk Scarf  
Ability: Shadow Tag  
EVs: 248 HP / 252 Atk / 8 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Gear Grind  
- Spikes  

Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 248 HP / 252 Atk / 8 Spe  
Adamant Nature  
- Water Shuriken  
- Sucker Punch  
- Pursuit  
- Gastro Acid  

Mewtwo-Mega-X @ Expert Belt  
Ability: Magic Bounce  
EVs: 120 HP / 252 Atk / 136 Spe  
Adamant Nature  
- Thousand Arrows  
- Bolt Strike  
- Sacred Fire  
- Beat Up  

Regigigas @ Focus Sash  
Ability: Huge Power  
EVs: 244 HP / 252 Atk / 12 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Play Rough  
- Gastro Acid  

Mewtwo-Mega-X @ Choice Scarf  
Ability: No Guard  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sing  
- Sheer Cold  
- Stealth Rock  
- Switcheroo