I played a lot when Pokemon first came out. But it slowly lost its hold - I found myself gradually playing less and less, and I've pretty much stopped. I think

I played a lot when Pokemon first came out. But it slowly lost its hold - I found myself gradually playing less and less, and I've pretty much stopped. I think the problem is that there isn't much keeping people around other than catching new Pokemon and leveling up. Both of those things get progressively harder as you go along, removing the incentives to keep playing. Maybe if there were some sort of quest system (and not the achievements) or real social mechanic, people would stick around for longer.