Shadow the Hedgehog game

My daughter would like a copy of this game for her DSi.There is one here that says it is for a Game Cube.(place www in front) ........romulation.net/roms/GameCube/Shadow-The-Hedgehog-(U)(OneUp).rar/#tab-forumIs this it?If so ...is it supposed to be as large as it is?
Is there something else loaded in that RAR that I would not want/need?Thanks ..

GameCube ISO file don't work on DSi.
Shadow Hedgehog only for PS2, XBOX, and GameCube.
And yes, ISO files are relatively large.