I want to link my new Wii U ID to my 3DS but I don't know what happens to badges.
1 Answer
You can format the system to remove the Nintendo Network ID without deleting it. Nintendo Network accounts removed in this way will not be deleted from the Wii U (if linked), and can be relinked to the same Nintendo 3DS system again in the future. For more information click here
Deleting a Nintendo Network ID will also delete the following information associated to the account: Nintendo eShop activity and balance, Friend List, Miiverse activity, and registered e-mail address