As soon as you get within range of Brock, the final Boss of Overtime mode, start doing knee drop attacks. He will block most of them. However, even the blocked attacks will damage him slightly. If you do the knee drops in fast succession, Brock will have a difficult time doing any attacks of his own.
Jump down to the front of the tank; he will follow you. As soon as he jumps down, perform the "Knee Drop" on him, if you have unlocked this skill. Then, jump back up to the top of the tank. Wait for him to jump back up and repeat. He will most likely not be able to block it, and in three to five hits he will be dead.
