Yo-Kai Watch 4 ++ Announced for PS4, Switch, Adds Online Co-op

PS4 version of Yo-Kai Watch 4 includes new elements that will also be coming to Switch.

Japan: Famitsu reviews Yo-Kai Watch 4 for Nintendo Switch - My Nintendo News

Yo-kai Watch 4++ for Nintendo Switch

Yokai Watch 4 ++ Save Game Editor for Nintendo Switch CFW

Y School Heroes: Bustlin' School Life, Yo-kai Watch Wiki

Yo-Kai Watch 4 ++ Announced for PS4, Switch, Adds Online Co-op, New Maps and Characters

Yo-kai Watch 4++ Announced For PS4 And Switch, Releases In Japan On December 5, 2019 - Siliconera

Yo-Kai Watch 4 Owners Can Pay To Upgrade To Yo-Kai Watch 4++ – NintendoSoup

Yo-kai Watch Games - Giant Bomb

Yo-kai Watch 4++: New area, Yo-kai and Pura Pura Blasters