A Pokemon MMO would be great.

next gen! when they release their handheld/home console hybrid :)

I don't think Nintendo would want to invest in that. If they go all out and make a pokemon game with its own original story, region amazing graphics and have every single pokemon up until now, then Nintendo would have to sell and insane amount of copies in order to break even.

and...

Companies do this all the time, thats why we get insanely expensive games like GTA, Skyrim, Uncharted, Halo, Final Fantasy etc.

And incase you havent noticed these are the games that sell alot, also Pokemon games sell

I would most certainly play it! I just do not think an MMO would work well for Nintendo, but I really think they could do one on console. It would surely be a system seller.