well, i dont really want to try hard this game and think how to actually defeat it. are there some cheats to this game?at that point you should be strong enough not to lose first match. And i think at some point you get help against black hole if you do well enough. ( although i don't remember which route i was at that time)
Just do new game + and try winning all story battles - you will get different route (although battle against black hole will be same )