You can use an existing Nintendo Network ID (NNID), Facebook, Google+, or Twitter account to sign in to your Nintendo Account by linking them together in your account settings. Once you’ve linked an NNID or social media account, you can use
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After creating a Nintendo Network ID you have easier access to your account across multiple Nintendo devices. Make the most of your Nintendo systems with a Nintendo Network ID.
You might have a Nintendo Account. You might have a Nintendo Network ID. You can connect them both and take advantage of features across your Nintendo devices.
If I buy Pokemon Gold and install on another 3DS, using my same Nintendo Network ID, would I be able to play (and trade) Pokemon Silver on one 3DS, and play (and trade) Pokemon Gold on my second 3DS at the same time, using the same Network ID