Mainly, because I doubt that they had one person do all the models. And a professional. Are you a professional? There is also the matter of the reference art, you don't just open up the program and model, you just go by the reference art. Maya is screwy when it comes to using a reference (Blender, of all things, does refrences better, anyway).
But what does that have to do with limited started selection? Pokedex 3D already has the models for all the pokemon anyway, so it is a non-issue.