Part 2: Take advantage of Pip's range and try to take him out from a distance .Try not to let him get above or close to you. If flank Pip, Weightless legendary is a great counter, especially to a jumpy Bomb King. Outjump him. Pip's control is better.

Part 1: Don't get close to him. With the new lag detection buff, he can track better and is able to kill you quickly by detonating midair. You will lose at most close range encounters vs him.