Before you can befriend a Yo-kai you must find them with the Yo-kai Watch. With the Yo-kai Watch's radar, players can track down invisible Yo-kai
Farewell, Yo-kai! - Yo-Kai Watch Guide - IGN
Tips and Tricks - Yo-Kai Watch Guide - IGN
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Yo-Kai Watch - IGN
Level-5 reconfirms that a new Yo-Kai Watch game is in the works, yo kai watch 5
Tips and Tricks - Yo-Kai Watch Guide - IGN
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Kyubi the Bully - Yo-Kai Watch Guide - IGN, yo kai watch kyubi