It is working with the Japanese version, at least. It has English + a couple of other languages. Saw it on a few private trackers as well.
Below are some additional background details on the Sonic Adventure 2 video game for those interested:
Sonic Adventure 2 is a platform video game developed by Sonic Team and initially published by Sega for the Dreamcast console, followed by a Nintendo GameCube port and high-definition versions for Microsoft's XBox Live Arcade and Sony's PlayStation Network.
Sonic Adventure 2 uses 3D graphics in addition to scrolling backgrounds. The game follows the same basic principles of previous...