Finding a 3D modeller that would be willing to make semi-professional models is hard enough to come by, let alone one that will be willing to model all 700 or so Pokemon, over 2000 3D model animations for every move, from scratch, every week, for free. There's probably SOMEONE out there, but you're looking at literally hours upon days upon weeks of work. If you look at Pokemon X and Y, Colosseum and XD: Gales of Darkness, Battle Revolution, you'll realise a good couple of years were spent on making them.
I know I have no authority over this, since I'm not a developer of Pokemon3D, but I have developed games, one including 3D models, and I can guarantee that doing a single model is a long process. At this point, it's more efficient for them to work on the sprites, and even then sprites can take ages to do.