Where is the wii registration code?

Answer 1

You get a piece of paper with the games made by Nintendo, where you need to scratch off a silver strip with a coin. This gives you the registration code for the game.

For the console itself, you need to go into the plastic bag with all the console's information (you know, the manuals, etc) and there should be two cards in there (i.e.: one for the console and one for Wii Sports). You just register them, and you're done!

Hope that this has helped!