Model not mine, all credits to Dubby: https://civitai.com/models/26116/pokemon-style
LoRA trained on the animefull-final model using the official artwork of the mainline Pokémon games. I'd personally recommend using this the most with AnythingV3.
For full body shots I'd suggesting using a resolution of 448x896, as this was the largest bucket in the dataset. Most resolutions still work quite well though and which you want to use can depend a lot on the pose/character you want to depict.
All artwork has been tagged with their respective generation (eg. generation 1, generation 2, etc.). Allowing you to get different styles, occasionally there's a bit of bleeding (mostly at gens 3 and 4) but its fairly consistent otherwise.
As for upscaling, I recommend using something like the anime ESRGAN models, rather than the default latent upscaling. As the Pokémon artstyle doesn't have a lot of details any new stuff added usually looks bad.