Mewtwo appearing as a raid boss at Pokemon GO event in Japan

The Pokemon GO Stadium event is currently happening at Yokohama in Japan. There, Mewtwo has appeared for the first time in Pokemon GO as a special raid boss, giving attendees a chance to catch this Legendary Pokemon. There’s currently no word if or when Mewtwo will appear outside the context of that event. We will keep you updated. Source

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Mewtwo appearing as a raid boss at Pokemon GO event in Japan