Mewtwo-Mega-Y @ Choice Scarf  
Ability: Shadow Tag  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Thunderbolt  
- Steam Eruption  
- Searing Shot  
- Sludge Wave  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Close Combat  
- Knock Off  
- Thousand Arrows  
- Gear Grind  

Mewtwo-Mega-X @ Choice Band  
Ability: Shadow Tag  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Petal Blizzard  
- Play Rough  
- Sacred Fire  
- Low Kick  

Deoxys-Speed @ Focus Sash  
Ability: No Guard  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sing  
- Sheer Cold  
- Gastro Acid  
- Stealth Rock  

Diancie-Mega @ Pixie Plate  
Ability: Pixilate  
EVs: 4 HP / 252 Atk / 252 SpA  
Lonely Nature  
- Fake Out  
- Extreme Speed  
- Gastro Acid  
- Boomburst  

Blissey @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Wish  
- Final Gambit  
- Whirlwind  
- Stealth Rock