Yo-kai Watch 4++ will be seeing a December 5th 2019 release for Nintendo Switch and PS4 in Japan. Includes a new online multiplayer mode, areas and Yo-kai.
Yo-kai Watch 4 - Metacritic
Japan: Yo-Kai Watch 4 Will Release On The Nintendo Switch 6th June, yo kai watch 5
Yo-kai Watch 4++ announced for PS4 and Nintendo Switch in Japan - LootPots
Yo-kai Watch 4++ launches for PS4, Switch on December 5 in Japan - Gematsu
YO-KAI WATCH 4++ Nintendo SWITCH Japan Game New Sealed Youkai (Level5 RPG)
Yo-Kai Watch 4++ Announced For Nintendo Switch – NintendoSoup
Yo-kai Watch 4++ announced for PS4 and Nintendo Switch in Japan - LootPots
Yokai Watch 4 ++ Save Game Editor for Nintendo Switch CFW
Yo-Kai Watch 4 & the future of the franchise
Yo-Kai Watch 4++ Announced for PS4 and Switch - Niche Gamer