Nope it doesn't give a name for it, and you'll see why soon. Anyway this fight is almost as easy as the one with Lord Crump at the beginning of the game I'm serious. All he'll do is dive at you doing a little damage every hit. Just beat him around with Mario's Power Bounce and Goombella's Multibont and then he'll get an opportunity to test out his copycatting ability! And thus he turns into a dark version of Mario.
He'll be a little stronger now because he'll be jumping and hammering at you which may do a bit of damage, but he's still effortless with a puny 20 HP left.Beat him a little more and watch as he drops to the floor just like normal Mario would.
HP 40 your partnes are the same hp that you laster have them before
Doopliss and Goombella! Yup but don't bother fighting with Goombella because Doopliss will just replace her for Koops and then Flurrie and then Yoshi...and Yoshi is a force you don't want to reckon. So focus all your strength upon just Doopliss. All he'll do is jump and hammer at you, which can be blocked with A or B. Goombella's a little more dangerous, but she still won't do anything that's too fatal. While Mario's Power Bounce is just that fatal...After two turns, Vivian will jump in and join Mario because "he's the only one who's ever been nice to her". Which is quite correct actually. Anyway the fight just gets easier! Doopliss's Mario form is still a bit tougher than the original Doopliss one but this still isn't anything too bad. Use Sweet Treat and Power Bounce invariably while Vivian just uses her fire attacks. Just try not to run out of FP and you'll be fine.