The Wii U contains a virtual Wii (vWii) mode that can also run homebrew.
(from archival sites like Internet Archive – search “Nintendo Wii Redump”). download wii wbfs games portable
By converting your collection to the portable WBFS format, you can easily carry hundreds of games in your pocket, ready for action on your Wii or PC. The Wii U contains a virtual Wii (vWii)