Pyroar and Aggron did the job for me.
Short summary: Fire Pledge + Water Pledge -> bye bye mist, hello rainbow.
Pyroar in -> Hypervoice -> 80 + STAB + item which boosts normal moves + rainbow which boosts sp. atk normal moves. hypervoice hits both pokemon. oh yeah. abuse hypervoice till Pyroar dies.
Gallade in -> Trick Room. Do your best Gallade, you will die soon.
Aggron in -> Steel very strong against fairy -> faster due to Trick Room.