Nintendo of Europe has put out QR codes for players playing Yo-Kai Watch 3 to receive some very rare Yo-Kai.

Scan the QR codes in the game to receive Hovernyan S, Tempurasan, Kyubot, Jibanyan Liu Bei / Komasan Sun Ce / Usapyon Zhongda, Komajhiro Ten, and Queen Usapyon:

Please note you need to reach a certain point in the game to receive these Yo-Kai. Full details on that here.