For this to work you must have 10 Ratton1 battle chips with you.First, when the battle starts, move to the back of the arena.Shoot one Ratton1 at Brightman. He will become open to an attack right before it hits him. The moment he takes damage, shoot another one. Repeat this procces untill he dies. Be sure to get the chip that comes out of him because it's a very good one!