Level-5 announced that Yo-kai Watch 3 is getting a free update in “Ver. 3.0” that brings new content including new Enma, Yo-kai, quests, and more to the three versions of the 3DS title.
Yo-kai Watch 3's New Update Adds Towns To Revisit, Plenty Of New Yo-kai And Dungeons - Siliconera
JRPG Jungle: July 2014
Originyan, Yo-kai Watch Wiki
Yo-Kai Watch 3 will have over 600 creatures – Destructoid
YO-KAI WATCH - Trailer (Nintendo 3DS) , yo kai
New Yo-kai City, Yo-kai Watch Wiki
Switch - Official Yokai Watch thread ., Page 2
I recently opened yo-kai watch 2 in my 3ds for the nostalgia and I still had a lot to complete, but some things didn't work (more info in comments) : r/yokaiwatch
JRPG Jungle: June 2014
Yo-Kai Watch 3 Review (3DS)
A Whole New Draggie, Yo-kai Watch Wiki
Switch - Official Yokai Watch thread ., Page 2
News - November, 2020
Yo-kai Watch 3's New Update Adds Towns To Revisit, Plenty Of New Yo-kai And Dungeons - Siliconera