I have a 3DS XL and I also have a Nintendo Network ID linked to it. I'm planning on trading it in to get a new 3DS XL. Would I have to do a system transfer to get my Nintendo Network ID if I deleted it off the system? If I got the new system and deleted my Nintendo Network ID off my previous 3DS, could I just put my Nintendo ID on my new system and link it that way?
Also, if you could link it to your system, will it save my purchases I've already made on my ID and would I be able to download it?