Seviper @ Choice Scarf  
Ability: Shed Skin  
EVs: 4 Atk / 252 SpA / 252 Spe  
Hasty Nature  
- Sludge Bomb  
- Giga Drain  
- Dark Pulse
- Earthquake

Seviper @ Life Orb
Ability: Shed Skin
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Poison Jab
- Earthquake
- Sucker Punch
- Aqua Tail

Seviper @ Life Orb
Ability: Shed Skin
EVs: 4 Atk / 252 SpA / 252 Spe  
Hasty Nature  
- Sludge Wave  
- Flamethrower  
- Giga Drain  
- Earthquake
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Optional Move(s): 
- Crunch
- Glare
- Switcheroo
Optional Item(s): 
- Black Sludge
Optional Ability:  
- N/A
Optional EV/IV(s): 
- 252 Atk / 4 Def / 252 Spe (Jolly)
- 4 Atk / 252 SpA / 252 Spe (Modest)
- 248 HP / 8 Atk / 252 SpA (Quiet)