This save editor does have bugs, one being that it directly modifies the save files that it opens, so make a backup of the save file before opening it with this editor. Also this editor is written in a very old language, however should still work for what it is intended to do. I used another source program written in the said language as a template, and made this Editor. When someone else create an SSB3DS editor and release it, that editor will most likely supersede this one.
Keep in mind...
[Release] Super Smash Bros 3DS Save Editor
Keep in mind...
[Release] Super Smash Bros 3DS Save Editor