Thenaya is a homebrew app which can program Amiibo dump files into blank NTAG215, making brand new Amiibos. It's the little sister of the
TagMo project.
Currently it is very much POC/Alpha stage. But it works for me (TM).
Usage is simple:
Copy the 3dsx/smdh files into 3ds folder.
Createa folder called "amiibo" in the sd root and put any amiibo dump files into it.
put the amiibo encryption key file to sd root with the name "amiibo_keys.bin"
Launch the app from homebrew launcher. Press X, select the file, press A, place blan NTAG215 tag on 3ds wait until finished.
I've only tested this on the New3DS, but hopefully it should work on the Old3DS as long as you have the NFC writer thingy for it.
Like i said it's mainly POC and needs time to get polished.
Downloads/Source Code
Credits extend to everyone who made TagMo possible. Specially to
@javiMaD and Yellows8 who appears to have put in the NFC api into libctru.