Probably, the Dolphin is the best emulator for WII/GameCube with the possibility of using the mouse instead of the classic Wii controller. You can download Dolphin from the official website, but you can also download it (the x64 version) from this direct link. There is also another version of the Dolphin emulator, a modded one, that is very reliable and supported by tons of features (we recommend to download this version) and is available here.
And here are the roms for Nintendo Wii emulators:
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