Last Christmas, my friend gave me her old Nintendo 3DS as a present and I've loved it ever since. However, she forgot to transfer her data over. Now, one year later, we've finally gotten together to do that, but now I have things on the 3DS I don't want deleted, but she wants some games she downloaded on her old console to come to her new console.
Two of the things of mine are the Pokémon Sun/Moon demos, but for some reason, it mentioned deleting some things relating to my Pokémon X data. I don't want legendaries or any other Pokémon being lost, since it mentioned something about deleting Pokémon X data. Most of the other apps are hers, most demos but one game she bought.
Would there be a way to change the NNID to mine without deleting things? Is there a way to just pick and choose things to transfer things back to her new 3DS? What would the wisest course of action be?