Define Bully! Is he in every hand, minraising or cbetting every flop?
Is he playing only once in 2 orbits and raising for 4+bb?
Or is he in every hand, raising huge from every position.
If its the later, congratulations, you hit a gold mine. Wait untill you have position on him and play a tight range. Don't!!! mindlessly shove with trash like weak Aces or low pocket pairs to "show him who's the boss". Don't gamble, there is no need to go broke agains a maniac.
Be patient, wait for JJ+, AQ+, KQ, take him to the flop IN POSITION and harvest him there. Obviously shove KK and AA, but even with QQ I often just call and shove when the board doesn't have an A or a K. Just hope that nobody else stacks him before you do or at least he reloads a bunch of times.
If you dont want to adjust and keep limping...well, look for an other table, you're not ready for the money rain
Edit: one last thing. Could it be that he is sitting to your right? If so he might just punishing you and your mates for limping in with trash. In this case, he is just better than you and there is no way for you to beat him yet. Look for another table.