Magnetman is hard because he has 1,000 hp you'll find him on the plane. The rich looking man uses him. First fix all 4 parts then youll see him on the 4th part. His electric (of course) so use plenty of grass techniques there the best. Once you get him to 500 hp he'll make a copy of himself and try to ram you. Its hard to dodge so crack the magnet panels the ones that pull you in the break them wait till they come back itll be easy to dodge him and the clone then ive never killed him but thats how i get him to 5 hp then im dead so work hard.