Pokemon: Skuntank
Name: Mixed "Sweeper?"
-Crunch
-Explosion
-Punishment
-Fire Blast / Hidden Power: Ice / Ground
Item: Life Orb
Ability: Aftermath
Nature: Naughty
EVs: 23 HP/252 Atk/232 Spd
Quite the contrary, Skuntank does have ONE thing over his cousin Drapion. Folks, may I introduce you, a "mixed" set. I don't know if this warrants overdramatic changes, but it's just to basically to use Punishment.
A quick review on Punishment. It starts with a Base Power of "1". Sounds stupid so far, right? Well, there's more. It's Base Power increases for each Stat boost from your opponnent (to make this sound simpler, 1 Stat boost = +20BP. Keep in mind that the "1" is not implemented after the stat boost). The Attack is capped at 200. However, this could pull an upper hand on CM Clefable, etc, in UU tier.
Now to get on with the moveset. Crunch is reliable STAB until you meet a person that uses stat boosting moves. After a while Punishment will become better in some situations, so this allows a switch-up. There's still Explosion, to keep an option if you are about to die. LO Explosion will hurt, no matter what basically (unless you're a Ghost, lawl). As far as a final move, it comes down to this. Fire Blast hits things like Bronzong and the like hard. HP Ice allows better coverage against Dragons in OU tier, but let's keep in mind that something like Altaria, Salamence, Garchomp, and Dragonite are faster and probably have a chance at using Dragon Dance / Swords Dance. HP Ground hits Aggron and Bastidon in the UU enviroment.
As far as HP Ground + Life Orb goes, it should KO Aggron. Bastidon is a tad bit questionable, but nevertheless possible.
I can't do calcs at the moment, but if I nab a chance at it later, I'll do it. Keep an eye I guess on this until then.