Ariados @ Focus Sash  
Ability: Insomnia  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Toxic Spikes  
- Sucker Punch  
- Poison Jab  
- Protect

Ariados @ Choice Band  
Ability: Swarm  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Poison Jab  
- Bug Bite  
- Sucker Punch / Pursuit
- Shadow Sneak / Pursuit
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Optional Move(s): 
- Agility
- Bounce
- Return
Optional Item(s): 
- Black Sludge
- Life Orb
Optional Ability:  
- N/A
Optional EV/IV(s): 
- 252 Atk / 4 Def / 252 Spe (Jolly)