I have seen a trailer of Pokémon Diamond/Pearl, I think. It's 2D. The graphic looks like Game Boy Advance, but good for GBA. But it's DS not GBA. If it was about to be 3D I would worry, since the graphic of Colloseum and DX is very very bad and the Pokémon attacks the air and still hit their opponents. In Stadium at least it looked as if they were touching the opponent when they used tackle, bite, double edge, etc. Colloseum is also very slow. The Pokémon does not emediatly attack when you choose a move, but waits a few seconds. And when you strike more than once your Pokémon attacks, the opponent is hit, you attack, opponent is hit and so on. In Stadium you attack X number of times and the opponent is hit X times, so that the camera don't need to switch so many times as when in Colloseum.