I saw some comparisons of unrigged models from pal world overlayed with Pokemon models and they had nearly the exact same pose and proportions with some geometry tweaked. The chances of them matching up that closely by chance is practically impossible, and there were several examples. One rip off model is not enough to win a case, but if there's a lot of them I think there's a pretty good case that can be built. Gameplay and concept wise, I don't think there's a case, but with the model infringement there may be enough to show a deliberate pattern of ripping their model files.

EDIT: Found the post: https://twitter.com/covingtown/status/1749462735291859423

The silhouettes minus the the extra details are nearly identical.