Fun thought I just had:
Ariados @ Scope Lens
Ability: Sniper
EVs: 252 HP / 252 Atk
IVs: 0 Spe
Brave Nature
- Focus Energy
- Cross Poison
- Shadow Sneak
- Fell Stinger / Leech Life
Put it on a Trick Room set, preferably with someone that could Baton Pass a sub to it (oh just imagine a sub AND Belly Drum Baton Pass, ooooo)
Once that happens, do the following:
- Focus Energy set up first turn
- Cross Poison for increased crit rate, STAB, and good base power
- Shadow Sneak for when the Trick Room wears off
- (Either of these) Fell Stinger for the lols and STAB / Leech Life for any sustain, and STAB
Late game sweeper anyone?
Now obviously this require a lot of set-up, but just... imagine sweeping with an Ariados. Yeah, this isn't JUST an individual moveset, it's an accessory for a team, but I still thought it was pretty funny. Tweak it any way ya like.