The state of emulation on the Wii is not as good as it is on the PC. PC emulators are free, hastle-free, very flexible, transferable, and you can use any joypad you want, with interlacing options or upscalling and filters. There's something for everyone and it's free and certainly less of a hastle compared to "injecting" files.
If you do go the PC emulation route, remember on PC you can use multiple save states, speed up for RPG grinding, slow down, cheat files, as barc0de says high quality filters which make a huge difference, and online play. If you want to do emulation, PC is the way to go.