Let me try and remember how this goes...
Aha, found the set.
Skuntank @ Life Orb
Lonely - Aftermath
252 Attack, 220 Sp. Atk, 36 Speed
-Sucker Punch
-Pursuit
-Hidden Power (Grass)
-Sludge Bomb
He's EV'd to hit 213 Speed, which outspeeds something important that I don't remember. After that Attack is maxed and the rest is dumped into Sp. Atk to make his Special moves hit like a truck. Sludge Bomb is his preferred Special STAB, which OHKOs s
hit like Tangela and comes with a healthy 30% chance to Poison the target, which can severely cut into a wall's longevity when it's losing 12.5% of its HP every turn. Hidden Power (Ground) is what Smogon used to recommend, but I find Hidden Power (Grass) is a better replacement that can 2HKO Alomomola after Stealth Rock while still hitting Regirock and the likes for solid damage. Pursuit lets him trap Spinblockers that annoy Wartortle (he also absorbs Toxic Spikes for Wartortle, which the turtle hates), and Sucker Punch gives him a good priority move to patch up his subpar Speed. Obviously not a sweeper but a potent threat nonetheless, and in my opinion so much better than physical Skuntank.
Here's a few examples of things that this set can do which the physical sh
it can't do.
220 SpA Life Orb Skuntank Sludge Bomb vs. 248 HP / 8 SpD Eviolite Tangela: 330-393 (99.09 - 118.01%) -- 93.75% chance to OHKO
(330, 335, 338, 343, 346, 351, 354, 359, 361, 367, 369, 374, 377, 382, 385, 393)
220 SpA Life Orb Skuntank Hidden Power Grass vs. 252 HP / 4 SpD Alomomola: 239-283 (44.75 - 52.99%) -- 89.84% chance to 2HKO after Stealth Rock
(239, 242, 244, 247, 252, 255, 257, 260, 263, 265, 268, 270, 273, 276, 278, 283)
220 SpA Life Orb Skuntank Hidden Power Grass vs. 240 HP / 0 SpD Regirock: 133-156 (36.84 - 43.21%) -- 99.19% chance to 3HKO
(133, 133, 135, 135, 138, 140, 140, 143, 143, 146, 148, 148, 151, 151, 153, 156)
220 SpA Life Orb Skuntank Sludge Bomb vs. 4 HP / 0 SpD Sawk: 157-187 (53.76 - 64.04%) -- guaranteed 2HKO
(157, 160, 161, 164, 165, 168, 169, 172, 173, 175, 177, 179, 181, 183, 185, 187)
220 SpA Life Orb Skuntank Sludge Bomb vs. 252 HP / 4 SpD Miltank: 165-196 (41.87 - 49.74%) -- guaranteed 3HKO
(165, 168, 169, 172, 173, 175, 177, 179, 181, 183, 185, 187, 188, 191, 192, 196)
As you can see it breaks stall so much better than physical Skuntank does by 3HKOing a lot of the prominent physical walls in the game, while still scoring most of the KOs that physical sets get with Sucker Punch and Pursuit.
And for the record, yes, that second part IS my nomination (if we're in the nomination phase or whatever. If not I'll save it until we are.).