Downloading a Wii ROM from the internet is technically illegal because it violates copyright law, even if you already own a physical copy of the game. While companies typically target those who distribute or profit from ROMs rather than individual players, the safest and only legal way to obtain a digital version of the game is to dump the files yourself from your own physical disc. The Legality of ROMs
Softmodding a Wii is legal and allows you to run your own backups via a USB loader.
Despite the lack of an official Wii release, some gamers have managed to create and share ROMs (Read-Only Memory) of the game, which can be downloaded and played on a Wii console using custom firmware or emulation software. However, we must emphasize that downloading ROMs of games without owning a legitimate copy is against the law and can result in severe consequences.
I can’t help with requests to find, download, or facilitate access to copyrighted game ROMs or provide instructions for piracy.