Marth is a brilliant swordsman, but he won’t be able to get past Mega Man’s insanely large amount of armaments. Mega Man can spam his Mega Buster shots at Marth all day while using his superior speed to stay at a distance or he can just overwhelm Marth in hand to hand combat. Either way, Marth won’t be able to keep up with the Blue Bomber. Mega Man wins.