Yo-kai Watch 2 Save File ((better)) Download -

: Importing a save file or transferring data to Psychic Specters will overwrite the existing data in that specific slot. How to Transfer Save Data (YO-KAI WATCH 2)

: Re-insert the SD card into your 3DS, open your save manager, and restore the backup to the game. Transferring Saves to Psychic Specters Yo-kai Watch 2 Save File Download

For the most "academic" approach to how these files are structured and edited, refer to community-maintained documentation: : Importing a save file or transferring data