That's if games with NAND saves can be dumped, modified, and reflashed without skewing keys and having our save wiped.
Saves seem to be allocated at specific offsets (there are already scripts that extracts and inject them) and probably its encrypted separately from the actual game program files, it would be only a matter of getting the keys that your console used to generate the save (a task that should be easier on a console using a flashcard). Unfortunately I don't have the knowledge to confirm my suspicions
RAM editing != entire RAM dumping. You only need to overwrite game specific offsets of RAM to make this work.You obviously have no clue what is involved in getting a RAM dump and how save signing works on the 3DS or you wouldn't be acting like it is such a simple task. Just to fill you in, you are way off.
And it was already done, and specifically envolving Pokémon, that was the way that event pokémons from X/Y were leaked.
EDIT: Yeah, save signing is another matter, still, easier to solve than finding kernel exploits or fake/proper signing programs. Nintendo and every console maker out there will use simpler cryptation on save files.