What happens if you delete your Nintendo Network ID, and where do the badges go

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I want to link my new Wii U ID to my 3DS but I don't know what happens to badges.

Best 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