Dark/Fighting, something with good special attack(base 110)/speed(base 120) and decent defense(100 hp and 85 in defenses)and barely useable attack(base 75)
Main attacks: Nasty Plot, Aura Sphere, Dark Pulse, Psychic (maybe elemental punches too)
Ability: Vital Spirit or Intimidate
OU, perhaps a possible Garchomp killer, probably a OHKO with Nasty Plot Aura Sphere always bypassing Sand Veil, even causing issues for the sub-chomp. Ability would allow switch-ins on physicals or sleep inducers(both of which are fighting-ish oriented). Perhaps somewhat like Mewtwo's younger cousin, if it had one. Weak to fighting and flying, and resistant to rock(stealth rock) and and ghost. Can usually take one solid hit, possibly activating a held berry on the turn Nasty plot is used. Sub-600 base stat total. Beats out Jollychomp and Adamant scarfed TTar for speed, and KOs both with boosted STAB attacks. Has a little more trouble with Flying types as it has no SE moves other than elemental punches which aren't worth the move slot. Would probably sport HP Ice to ensure a KO on chomp. Hits phasers hard on forced switch, but TWave Blissey would could cause problems. It could have 404 subs too. Not really anymore special moves other than the types listed already, but could have a big physical move pool, being fighting type and all.