You have several options to play these games in French without risking your computer's security or breaking the law.
Some sites offered pre-patched ROMs with an emulator (like DeSmuME or Citra) pre-configured in French. These were commonly labeled as "Inazuma TV FR Games – Téléchargement Direct." Inazuma Tv Fr Games
One of the last major official French releases. Physical copies are now extremely valuable. You have several options to play these games
As of March 2023, the Nintendo 3DS eShop is closed. You can no longer buy digital French versions. If you already own them, you can re-download. and challenge mods for existing games.
French fans also created 100% complete save files, custom teams, and challenge mods for existing games.