I’m dedicating this fight to Mario Galaxy 2. This is a really classic fight that’s been going on for decades. They both made there debut over 20 years ago. Back than Mario didn’t have all of these wild powers. He was just a plumber/animal hunter who knew how to fight. His grudge with Bowser started when Bowser kidnapped Peach and Mario had to go save her. Usually you’d touch a switch and a bridge would fall, leading Bowser to his doom.

Since than Mario has gotten older and more colorful. His character design was drastically changed, but it was for the better. Bowser got a koopa clown car and his character design changed as well. Even than Mario would still defeat him but Bowser would take it like a man. He would take the defeat with dignity and try again in the future.

Way later Mario finally appeared to look real and went to Peach’s castle to get cake. However Bowser’s magic powers made there debut and he cursed the castle. Mario had a difficult time finding her but he did it without crazy super forms. Bowser would have beaten Mario but he decided to help Mario finish him off by giving him spike balls.

Finally the losses started to get to Bowser. He gave up on the idea of ruling the mushroom kingdom. Now his greatest goal in life is to make Peach give him cake. Peach made the cake for him but Mario knocked him out before he could have it. Bowser has lost most of his honor in current days.

Than because Mario wanted to give Bowser even more humiliation he made a new universe made of paper were he defeated Bowser with incredible ease.

Since than Mario’s grown a lot and learned new tricks. He has since stopped saving Peach as often and saves other people like Paulene and Rosalina. Peach has also started to appear less probably mad at Mario for these acts. Bowser has also grown and changed his looks more.

Now Mario has become a flat on adult relying more on brute strength than athletics. He still beats Bowser, but now Bowser is more of a mindless monster who wants to get Mario. Not all of this is cannon. A lot of it is actually fan fics about Mario but nonetheless I count fake things to (sometimes)

So after all of this I think we have reason enough to say Mario wins. After all he has one final trump card. He has reached Super Saiyan mode and that’s unstoppable. Mario wins.