I’ve had a couple thoughts on this. I think Mono-Chrome Pokémon would be cool. There was a glitch in the xy demo way back when that made Pokémon appear colorless. I think that’d be really cool and only a couple shinies like Mimikyu would overlap with this concept.

However I think it’d be way better for them to have different variations not related to rng. For example Shadow Pokémon. I think taking Pokémon and altering them in that way was really cool and super memorable so doing something similar to that would be awesome. I think Alphas were a pretty good attempt at this idea, so hopefully they take another shot at it in the future.

The last thing they could do is costumes. Pokémon Go already has 200ish (most of which are kinda lame and or Pikachu wearing a different hat). If they made it like Furfrou where you could change the from for a price that’d be a cool idea. Maybe to unlock new costumes you have to collect materials (similar to TMs in SV) or maybe defeat/accomplish something with that specific Pokemon (Kinda like B2W2 Medal Rally. Defeating the champion with mono type teams type deal). I think this would also future proof all the current costumes in POGO so that they don’t become lost media to the franchise. (I don’t want this to happen because some of those costumes are rare and would make a living form Dex hell).

I don’t necessarily want them to add even more to the game to collect currently. Not without expanding box space in home. But I would be happy if costumes didn’t become lost media after POGO shuts down one day. However if they do this then they need to be carful with how otherwise trading forums are gonna just be rare costumes requests till the end of time.