I don't actually know because on mine, i don't think it saved so now i have to beat dark bowser all over agian, so i don't know if it is supposed to do that, or mine has a bug. what happens is that the ending is shown then the credits and that's all. it don't save after you beat him and you cant save it your self either. so the game will always start from your last save point.
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You don't
35 or 40
well first of all, in almost every video game who wins, the good guy or the bad guy? (even though bowser in technically bad) It's the good guy of course. so if you play it right and beat dark bowser he'll explode. besides bowser doesn't explode... he passes out. (unless you battle him and beat him)
He is part of the Dark Star that stole some of Bowser's Binary Code. And when Mario and luigi defeat the dark star while in bowser's body, it becomes very dangerous. That is who dark bowser is.
No, you can't save after beating dark bowser