Knight Dude
Keeping it going.
Hey why does Mario not have a stomping technique like Bowser, Dedede, Yoshi, etc..? It is his original attack and it his how he dispose most enemies and much more than jumping up into them (like his up special).
I think that Bowser had a ground pound first. In Super Mario 3 to be exact. And Yoshi first got his in Yoshi's Island. Mario started to use one in Mario 64, which was a few years later. But I think Mario used one the most. Then again, Ground Pounds are sort of common in platformers.
Thought it is an iconic attack that he could use none the less. But the question is whether or not he'll have any moves to replace to make room. Can't be FLUDD, we know that he's keeping that as of now. And if it gets swapped, it could get replaced with something from Mario Galaxy, like the Spin attack.
If you are talking about regular jumping on stuff, that might be a little hard to pull off in a fighting game. Hence why Mario has the Super Jump Punch, it's a means to represent his main ability in his games.