>>52971674Main difference being Ash actually used the pokemon he had at Oak's. He spent time with the vast majority of them and trained with them on his journeys. He didn't just catch pokemon left and right, then send 95% of them to oaks before he had a chance to use or bond with them.
Yeah, Goh can just train any pokemon he caught if he really wanted to, but it's pretty clear he isn't interested in doing so in the slightest. Putting almost all of your work into galar starters is only going to get you so far.