Hello :-)
I'm new using Retroarch as Wiiflow-Plugin for Gameboy, NES and SNES.
(I used VbaGX, FceuGX and Snes9xGX before)
I connect my Wii to my HD-ready 16:9 Flatscreen-TV with a component-cable.
As far as I know these are the correct Wiiflow-Plugins:
For Gameboy: Gambatte 1.0.0.2
For NES...