Re: Four New Videos of Pokemon Diamond and Pokemon Pearl!
It was a decision by the creators of the game. They figured it will sell more on thier newest handheld than their old one. Besides, the GBA isn't selling like it used to, and they can't have the updated graphics and features on the GBA, so it will be a DS exclusive... at least that is why I think it is for the DS. If you can't afford it, start saving up your allowances.