I've had this set running quite a while on my ghost and dark mono types, in UU (and OU alike) yet I haven't really seen another one alike around;
Spiritomb @Black Glasses / Lum Berry
252 Atk, 252 spdef, 4 def Or defenses reversed.
Adamant Nature.
- Taunt
- PainSplit
- Sucker Punch
- Pursuit
What this set aims to do is simple: Lure in a setupper, taunt em. Painsplit em. Finish em.
Keeping the HP low yet the defense stats high will allow you to survive most set up boosted moves to atleast to the 2OHKO area, which you can keep picking back up to thanks to painsplit that is most likely taking the bigger chunk from your foe. The STAB sucker punch tend's to leave quite a hole to anything that does not resist it, while pursuit makes sure this tomb leaves it mark to it's victim that might want to run away.
The EV defense spread is quite up to the user, but I recommend keeping it spdef cause many physicals probably wont switch on thinking it will will-o-wisp.