Ha, I just gave my friend an extra gamecube and a copy of this because she never had a chance to play it. Really, Colosseum is a half-finished game tacked onto the real product; a 3D battle set up for Gen 3 games. It's still pretty neat, and I do like the art direction, but some of the logic is just baffling. You have like, what , 3 computer boxes, when you can ONLY have 45 Pokemon, tops, EVER? Come on. They should have had an option to upload more pokemon sans trading.
XD tried it's damnedest, but ultimately it wasn't very good either, and it's Pokemon selection felt worse.