Venomoth @ Leftovers / Black Sludge
Ability: Tinted Lens
EVs: 252 HP / 252 Def or SpD / 4 SpA
Bold Nature / Calm Nature
- Sludge Bomb
- Quiver Dance
- Baton Pass / Hidden Power [Rock]
- Roost / Giga Drain
This originated as a Venomoth from a random battle. It sweeped the opponent, so I thought it was pretty good.
Item: Leftovers or Black Sludge. Use Black Sludge for Thief opponents.
Ability: Tinted Lens to up Sludge Bomb's power on types defensive against Poison-type, or Wonder Skin to prevent some hits.
Nature: Bold/Calm. None of the moves are physical, experiment between the two natures and see which is better.
*EVs: 252 HP, 252 Def (or SpD if using Calm Nature), 4 SpA. The bulky set makes it last longer as your team's sweeper.
Moves:
Sludge Bomb - This was the main and only attack of the Venomoth prototype. (AKA the one from the random battle). STAB, chance of poison for life draining, and can be boosted by Quiver Dance.
Quiver Dance - Ups stats. Useful for sweeping. You might consider using the Bold nature, this can be responsible for upping SpD against Psychic-types and Fire-types.
Baton Pass - Passes on Quiver Dance buffs.
or
HP Rock - For Fire- and Flying- coverage.
Roost - Health regeneration, though makes you more vulnerable against Rock-types.
or
Giga Drain - Same thing, but it doubles as an attack that can be powered up with Quiver Dance. Won't be effective against a couple types though.