Niantic is continuing to host new events and reveal new features for the millions of Pokémon GO players out there. The developer of the immensely-popular mobile game has been teasing new types of mysterious Raid Eggs, which are indeed related to the Pokémon GO debuts of Espurr and Meowstic. Espurr will make its Pokémon GO debut via appearing in one-star raids for players to battle against and eventually catch.
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—The Pokémon GO team
Source: Official Pokémon GO blog