Avalugg is good. Solid recovery, good Defense, and I use Rocky Helmet on mine,
Mega-Absol + Mold Breaker Haxorus is a great combo. Everyone is using Rotom-W/Sableye, and Mega-Absol has Magic Bounce. Mega evolve when they're going to use a status/hazard and set up Swords Dance. Then when they switch, Baton Pass to Choice Scarf Haxorus and watch him destroy. This is mostly for mid/late-game, after you've taken out the fairies and/or the flying types you can't hit with Earthquake.
PSN: GiroTheHero "In a world without flatbread, we would have been Giros." ~Oroken
Gardevoir It's Trace and its really high special attack and speed are ridiculous, had quite a few sweeps with this thing. Can't wait for bank and Hyper Voice in mega form with Pixilate.
Sableye He just shuts down so many offensive threats its insane, not to mention can out wall most walls unless they run taunt and swagger with prankster.
Zoroark Okay to be honest this thing is more a troll than OP but I've swept a couple of teams with him with Dark Pulse and Sucker Punches and forced some really silly switch ins when they think they see a Dragonite or something.
I still don't believe most people on gamefaqs are even gamers. Just assuming they are embodiments of hate and stupidity taking digital form.