How does it work?
I’m not sure, but I think you need to enable wandering (or whatever) for each individual Mii, and have other people’s Wii friend codes in your adress book.
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After creating a mii, you can set it to ‘mingle’, at which point it’ll occasionally appear on the ‘mii parade’ where people from around the world will be able to download it.
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There is an option in the mii channel to send individual ones to people on your friends list. You just pick a mii up, drop it in the message and send it off.