>>13914624Pokemon is a social game, and handhelds promote that. Trade or battle anywhere with anyone. Portability is one of the biggest reasons Pokemon is such a success.
Aside from that, its gameplay doesn't lend itself to long console sessions either, as opposed to portable where you can just play on and off with ease. Why do you think Colosseum and XD flopped so badly? Its because it gets boring actually sitting down in front of a TV playing Pokemon-styled gameplay