Nihilego @ Black Sludge  
Ability: Beast Boost  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sludge Bomb  
- Power Gem  
- Thunderbolt  
- Stealth Rock  

Nihilego @ Grassium Z  
Ability: Beast Boost  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sludge Bomb  
- Power Gem  
- Grass Knot  
- Stealth Rock