Bowser v.s. DMCverse.
Bowser has a full year prep, access to all of the resources he's displayed, his army and minions ect, magic, technomancy, and he can capture things from the mushroom Kingdom during this time, Mario is forced to take a one year Hiatus while Bowser prepares.
He must take on everything in the DMCverse, all dead characters are revived and given a full rundown of what's about to happen one week in advance. Who wins?
Also, no toonforce copout arguments.