Spiritomb @ Choice Band
Adamant or Impish nature 58 HP/ 200 Atk / 150 Def / 100 S. Def
-Shadow Sneak/Sucker Punch
My take on the "Tricky Kill'sya" move set. Fair warning, this hasn't been play tested, just playing around with the set posted by Josh to work in Foul Play, which was added to Spiritomb's moveset via B2/W2 tutors. Trick gives your foe the choice band while swagger pumps up their attack stat as it confuses them, working the same way as confuse ray on a switch, but netting you a choice-banded swagger boosted STAB Foul Play on any bulky physical attacker that stays in thinking they can take you. Swagger works with Foul Play on the set, giving you a truly frightening stab against physical sweepers. Shadow Sneak rounds off the set, giving you a reliable priority STAB to use with Choice Band or to revenge kill confused foes.
EVs have been reworked to give more physical bulk in case swagger backfires. A Defense increasing nature could also be chosen to increase survivability against a boosted physical attack, though it will likely cause noticeable reduction of damage output on the already weak Shadow Sneak. You could try swapping Shadow Sneak for Sucker Punch on this set (Since Dark and Ghost have very similar type coverage) to increase power, but it's less reliable.