I usually get flamed for smacking CB's on prevalent special attacking threats
This is actually one of my favorite things to do(This, or Specs on a physical attacking pokemon). The surprise factor often nets you a KO, which can often be the difference between a win and a loss. One of my favorites has been:
Absol@Choice Specs
Nature: Modest(Can also be Timid, but generally the more power the better)
EVs: 252 Sp. Atk / 252 Speed / 4 whereever
Dark Pulse
Thunderbolt
Ice Beam
HP Fighting
The specs give him 408 Sp. Atk, which is enough power to OHKO most physical walls that switch in on him.