How do you kill starscreem at the last point on transformers decpticons on ds

well it depends on wether your stuck on getting him to battle you or you cant kill him in the battle well in the battle you have to dodge the missiles by strafing (moving right and left) but if your trying to get him to battle you knock it out of him by punching him behind his back then keep on doing that until he drops it then get it and get more health then press y and you will hit him with it then you can battle