Unorthodox Cofagrigus (any variation really) counter, but it should work.
This set should also work as a decent check to a lot of boosting sweepers, better against special sets, but priority Haze is obviously at least going to serve as a last ditch stop to almost anything.
Murkrow (F) @ Eviolite
Trait: Prankster
EVs: 248 HP / 8 Def / 252 SDef
Calm Nature (+SDef, -Atk)
- Taunt
- Toxic
- Roost
- Haze
If this set switches into a +2 Hidden Power fighting it does 39% max, then 20% max after the haze, and priority Roost will out heal +0 super effective HP fighting (39% - keeping up?). Taunt stops Trick Room, or Will-o-Wisp / Rest from more defensive sets.
This is pretty much just the standard stall-breaking Murkrow with Haze to stop boosters. Besides the mutual Electric weakness (which Manectric abuses very well) Murkrow has excellent defensive synergy with Qwilfish.
Now, Mandibuzz is the obvious choice, but Murkrow is Mandibuzz + priority! (-physical bulk, but who's counting lol)
No seriously, Spud's Mandibuzz is probably the better choice (and I will be voting for it), but meh Murkrow is cool.