: Your system must be jailbroken. If it isn't, follow the official 3DS Hacks Guide to set up Luma3DS and FBI.
Navigate to SD -> (your folder) -> Yo-Kai Watch 3 Undub.cia . Yo-Kai Watch 3 (UNDUB) 3DS CIA
: If the "undub" is provided as a patch rather than a full CIA, you must: : Your system must be jailbroken
Copy the CIA file into a folder on your SD card (commonly named "cias" or "games"). : Reinsert the SD card into your 3DS and power it on. Open the FBI application from your Home Menu. Yo-Kai Watch 3 (UNDUB) 3DS CIA