The suffix in ROM naming conventions indicates a Japanese region release. One Piece: Great Pirate Colosseum was never officially localized for North America or Europe. This means:
The 3DS console is compatible with ROMs, but players need to ensure that their console is flashed with a custom firmware to run ROMs. This process can be complex and requires technical expertise. One Piece- Great Pirate Colosseum ROM 3DS -JP...