I doubt there ever will be a Pokemon MMO,
A pokemon MMO would make all the new versions of Pokemon useless since there's already an MMO of it. There would be shitloads of balance issues etc.
Everyone would love it though, but the aim at children, who can't afford a monthly pay.
The closest thing to a Pokemon MMO would be Shin Megami Tensei - Imagine, or that Digimon MMO that's not here yet.
