This works at least in 3 star. If you're having trouble with him just df1 constantly with Heihachi. He literally can't stop you unless he backdashes, so watch for when you miss. Launching him will only cause him to break out of the combo and waste time flying. You can get away with some launches in Devil 1, but Devil 2 imo is an all ground fight. When he heals the first time, do single left punches and his rage art can't hit you even when power crushed. Start df1'ing again until second heal, after which you should side step and watch for lasers. You want to electric him during the lasers since he can't counter attack during them. Special Note that he passively slowly heals, so you have to keep the pressure up the whole time.