I have changed my Dusknoir set, since the Taunt/Sucker Punch strategy doesn't really work for me.
My Dusknoir now looks like this:
Dusknoir @ Leftovers
Ability: Pressure
Adamant nature (+Atk, -S.Atk)
EV's: 108 Atk, 200 Def, 200 S.Def
-Shadow Sneak
-Will-O-Wisp
-Pain Split
-Thunderpunch...