This was so disappointing - somehow despite coming out almost a decade later, this has less content than the Pokemon Stadium games. It is an extremely bare-bones battle simulator. Doubly disappointing given I was hoping for a Colosseum 3. Triply disappointing since D/P/P is my favourite generation, so I would've loved to experience a flesh-out 3D game using my team from the DS games. The graphics are great, which is about the only thing going for it.
This is the game that got me hooked into Pokemon. Bring my Pokemon Diamond jpegs to lively 3d animated pokemon that breath, blink, have unique & detailed animations, and even the trainers would throw the Pokeballs the Pokemon were caught with, dooooooooood 8 year old me was elated. To this day, I dream of a mainline Pokemon game that looks and feels as lively as Battle Revolution did. The stadium, the announcer, the music, the trainer & pokemon animations, I could go on. Have a look at what I mean https://www.youtube.com/watch?v=ofaU76iyZ-A
Most lively and unique battle animations in the franchise compared to the series later full-on jump to 3D.