Yep. It's real. Made by Niantic, the creators of the mobile game, Ingress.
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This game won't replace the main series games; Jinichi Matsuda said they are hoping to build some sort of connectivity between this game and future games in the main series.
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Pokmeon Go Plus. A Bluetooth watch to allow you to notify of events in the game without having to look at your phone. Basically, looks like a Pokeball on a watchstrap.