Because translators cannot legally package ROMs, fans utilize specialized patching software to insert English text into a clean Japanese Granbo ROM. The community process typically involves: Finding a clean Japanese ROM file of the game.
Because Granbo arrived late in the GBA's life cycle outside of Japan, Capcom never localized it for Western audiences. Non-Japanese players who attempted to play the original ROM frequently ran into walls due to the game's heavy reliance on text for menus, robot customization, and tactical battling.
The term "exclusive" is frequently thrown around in retro gaming circles as a marketing buzzword. In the case of Granbo , sellers and collectors typically use it to describe physical reproduction cartridges that contain completed or highly advanced fan translations that might not be easily accessible on standard mass-market ROM hosting sites.