This dictation on what’s significant to you guys and what isn’t is so jarring lol. It’s never too late for any of Ash’s Pokémon to get some development, especially when this saga Ash is shown training as much as he did in SM, which is not a lot.
Group interactions, learning new moves, personality display, or even just training for the next gimmick Ash’ll use, we need all of that because we simply don’t get enough of it. It can’t be forced if literally nothing else is happening in the story lol! There are no subplots happening, all that’s happening is the overarching Project Mew and PWC stories which come and go, so there needs to be stuff taking place in between those episodes.
In all honesty, these reactions sound more like complaining for the sake of. After a few appearances spread out over 2021, and a decent performance in Volkner’s battle, Gengar is now getting the spotlight totally on it. There’s still an entire year+(?) of the show left, 3 more major battles for Ash in his current Class, and no other major story arcs on the horizon that could take away its spotlight, so there’s more than enough time left for anything. So again I ask, what exactly is the problem?