So over the past 3 generations, Gamefreak has been using what seem to be the original models from the first fully 3d Pokemon game, Generation 6.
I'm absolutely okay with them doing this, as those models seem to be transitioning just fine to higher resolutions. I actually find it very exciting that they made 'future proof' models so that they don't have to spend so much development time and resources rebuilding models time and time again.
That being said, I find the Pokemon to look rather bland in fully realized HD, overall. A lot of what I'll suggest in this thread would totally changed the series from the 2d, animated cartoon look it currently holds. I'll use Onix as an example:
To me, the linework on the 3d model doesn't translate well into HD. I think Onix would look much better with a more detailed rock texture, without solid lines separating angles.
Same thing here with Charizard. The outline of the belly or the line marks for the knee. I would like to see the textures of these models updated to a slightly more detailed look. Not hyper realistic like an Arvalis drawing or the Detective Pikachu movie, but more in line with what we see in the Mewtwo Strikes Back CG remake.
Now, I do understand that these renders are from a CG movie, but I believe that the Pokemon series needs to strive towards this sort of overral visual for the creatures. The hint of scales on the bodies of the reptilian creatures, the fur textures on Vulpix or Pikachu.
I believe more detailed textures will really freshen the look of the series and be highly praised by the vast majority as a step in the right direction. Once again, I'm definitely not calling for hyper detailed realism.
Same thing with characters. I think it would be great to see more detailed textures on the clothing of the characters.
Luigi's Mansion 3 was able to pull it off very successfully.
I'd also like to add that if Pokemon could adapt a lighting engine even half as good as Luigi's Mansion 3, the Pokemon would look even more like the movie renders I shared above.
Moving on to environments:
Some World of Warcraft forest I found with a quick Google search. I like this aesthetic, and the use of deep, vibrant color.
A background from a Pokemon animated movie.
I would like to see the environments try to up the ante a bit in terms of detail. I will say I think Sword and Shield have some really beautiful environments, from an artistic standpoint. I really, really love the use of color in Sword and Shield, from what I've watched.
I think that's pretty well all I've got for my suggestions.
I'm hoping the next generation is given a good long time to cook, and we can maybe get something on the level of something like this:
But with a more Pokemon aesthetic. The Switch is definitely capable.
What do you want?