Downloading copyrighted games that you do not own is illegal in many jurisdictions. The Internet Archive hosts a variety of content, some of which may be protected by copyright. It is generally accepted that format-shifting games (creating a backup copy) is permissible only if you own the original physical disc. Proceed at your own risk and always support developers by purchasing games legally.
Internet Archive (Archive.org) is a primary destination for Wii enthusiasts because it hosts massive, user-contributed libraries of game backups. Using files in descargar juegos nintendo wii wbfs internet archive