Gohan spends a year in the hyperbolic time chamber in training AFTER he got all of his powers back in Dragon Ball Super. So, this would be him actually doing something with the already-powerful Ultimate/Mystic form that ended up getting trampled on the grand because Gohan becomes the most powerful in the universe and doesn't do shiiiiit.
How does an actually trained Ultimate Gohan do against his old man in his SSB form?
Considering, even after he slacked off for a decade plus, he was able to return to pretty good form after a few sparring matches with Piccolo, I'm curious how Gohan's seemingly endless potential would do against someone who ONLY trains.
Edit : Whis is there to train with him