I have one bought in the uk that I use in Argentina. It works on my telly here, but only in black and white. There are some TVs that will work in colour with no problems, but you'd have to check when buying the TV.
Well it is different UK (Pal) Brazil (Pal-M) We had a nintendo game cube a few years back and only worked black&white in Brazil, even in the newest TVs. Not sure about Wii but would be nice if someone could actually confirm it. Thank You x