The easiest way is to get about 7 superrobo suit lv100 equip them and go to finish Baal or Rozalin off. If you are not that good than you should find out about the tactics i used. On Baal you would need to steal the equipment off him and than lift him every turn after you attack him. I sugges that you use gravitons bomb when he has fire -50% and braveheart twice all the time. If you have a prety good monster you can attack with him as well.