Sash Abra works well if it's Sash isn't broken. It can take a Mach Punch and KO with Psychic. You have to play Abra cautiously early game though, because if another mon takes it down to 1 HP, Timburr just kills with Mach Punch.
Tentacool is also an interesting counter. Scald can burn, which helps whittle down Timburr's HP, albeit boosting his attack. It hits on the special side so it is unaffected by Bulk Up. Tentacool possesses Liquid Ooze to keep Timbuur from healing with Drain Punch.
Edit: Shelmet is also amazing at walling Timburr, along with every other Fighting type in the tier (besides Mienfoo with Stone Edge). He can boost his Defense to combat Bulk Up. He can't really do much in return as Bug Buzz is a 9HKO, but he does prevent Timburr from completely running through your team.
Last edited by Nebuchadnezzar; Feb 27th, 2013 at 11:22:32 PM.