I didn't do too much because I rolled my eyes at how unnecessarily tough they made the last boss. Every advice or FAQ said that I have to grind no matter who I take it on as, and while I tolerate level grinding in an RPG, I won't do it in a fighting game. The sequel sounds cool, but I haven't picked it up for this very reason.

EDIT: Crap, misread the date of the last post as late January. I hate to bump an old thread. Whoops!