Gengar-Mega @ Black Sludge  
Ability: Normalize  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Entrainment  
- Gravity  
- Toxic Spikes  
- Whirlwind  

Zekrom @ Leftovers  
Ability: Unaware  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Relaxed Nature  
- Core Enforcer  
- Stealth Rock  
- Spectral Thief  
- Roost  

Mewtwo-Mega-X @ Leftovers  
Ability: Contrary  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Superpower  
- Drain Punch  
- Power Trip  

Mewtwo-Mega-Y @ Power Herb  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Geomancy  
- Psystrike  
- Aura Sphere  
- Taunt  

Blissey @ Leftovers  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Recover  
- Thunder Wave  
- Toxic  
- Rapid Spin  

Mandibuzz @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Spikes  
- Roost  
- Foul Play  
- Spectral Thief