Mewtwo-Mega-X @ Focus Sash  
Ability: Huge Power  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Play Rough  
- Sacred Fire  
- Horn Leech  
- Iron Head  

Gengar-Mega @ Choice Scarf  
Ability: No Guard  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Trick  
- Sing  
- Gastro Acid  

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

Yveltal @ Lum Berry  
Ability: Prankster  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
- Knock Off  
- Gastro Acid  
- Roost  
- Haze  

Diancie-Mega @ Expert Belt  
Ability: Pixilate  
EVs: 252 Atk / 4 Def / 252 Spe  
Naughty Nature  
- Fake Out  
- Extreme Speed  
- Freeze-Dry  
- Iron Head  

Metagross-Mega @ Choice Scarf  
Ability: Huge Power  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Diamond Storm  
- Trick  
- Knock Off  
- Gear Grind