Primeape with Close Combat/Endeavor/Vaccuum Wave/Counter and Focus Sash. Don't forget Vital Spirit.
Completely shuts down Smeargle ( like shown here
http://replay.pokemonshowdown.com/ou-115066284 ) and has fucked up many a Baton Pass team that have tried to set up, is a good panic button to use against an attacker that is building up power when you want to use Counter or Endeavor to take advantage of the Sash and Primeape's less than stellar defenses ( stops a Malamar in this one
http://replay.pokemonshowdown.com/ou-115087780 ).
Ghosts completely counter him, but you should have someone else on the team to be prepared for that, there are Pokemon that Primeape has no business being in on, and the vast majority of them include Ghost types.
I always figured Primeape to be an inferior Infernape, but he definitely set himself apart with this little set right here.