Level-5 has announced a Japanese release date for Yo-kai Watch 4. The June date comes alongside a new trailer and a relaunch for the game's official website.
Yo-kai Watch Academy Y Gets New Trailer - RPGamer
Yo-kai Watch 4 Gets GeGeGe no Kitaro Crossover, Additional Details - RPGamer
Yo-kai Watch 4 coming west - Gematsu
Yo-kai Watch 4 - Japanese Version 1.3 Update Art and Screenshots - NintendObserver
Yo-kai Watch 3 - Metacritic
Level-5 Confirms Western Release Plans for Yo-kai Watch 4 - RPGamer
Level-5 Shows Its Yo-kai Watch 4 Demo - RPGamer
Yo-kai Watch 4, Yo-kai Watch Wiki
Yo-kai Watch 4++ details multiplayer mode, new quests, and more new yo-kai - Gematsu
EP164, Yo-kai Watch Wiki
Yo-kai Watch 4++ Releasing in Japan in December - RPGamer
Yo-kai Watch Jam: Yo-kai Academy Y Announced - RPGamer
Yo-kai Watch 4: latest trailer, official website update (+ 6th Yo-kai Watch movie announced) - Perfectly Nintendo