Good concept, but I'm afraid you wouldn't get too many people paying $20 USD/month to play it, there's already a vibrant Pokemon community, but many like it 2D because Nintendo hasn't done the best job with 3D effects (except the windmills at Valley Windworks). Additionally it doesn't have the addictive war battle system WoW has.
Could be done, but will be an extremely risky investment.
It wouldn't just have just someone, it'd have to be a team of workers.
Hack preventers, financial managers, programmers.....the whole kitten caboodle.