darkSpyro

I found this on a video by TTD, I'm not sure if it's something for like a Mario Game or it's actually Dark Hammer Slam Bowser's Bio

While the Dark Star was gathering DNA from Bowser's body, Mario and Luigi tried to stop it before it succeeded. The brothers managed to defeat it, but apparently, it had already absorbed every piece of DNA that it needed, and it transformed into Dark Bowser, although still in a ghost-like state because he was incomplete. The only parts missing were the legs, which it obtained by inhaling Dark Fawful, thus completing his form, and becoming solid in the process. He flees from Bowser, but when Bowser finds him in the secret tower of Peach's Castle, they both execute flame breath attacks that clash with each other, initiating the prologue to the final battle. Bowser overwhelms Dark Bowser, then they both curl up into a spike ball and the fight commences. Bowser again overwhelms his dark form, who then unleashes a dark hurricane over the Mushroom Kingdom, trapping Broque Monsieur, the Blue Paratroopas and several Toads in bubbles. Bowser is now the only one who can defeat his doppelganger.

I think TTD just made it up, if VV really wanted to reference the Mario & Luigi series they would be loyal to the series' tone and handwave as awesome powers of evil.

I honestly think Dark Hammer Slam Bowser should have been replaced with Dry Bowser