Further details have come out of the Pokémon GO Park event being held in Yokohama Red Brick Park and the Cup Noodle Museum Park, Yokohama on August 9 through August 15 as part of the Pikachu Outbreak 2017 event. The parks have been renamed as Kanto Park and Johto Park, respectively, with Pokémon from each region appearing more in their respective park. During this event, while many PokéStops will be added, players will also be able to get access to more common spawns of Pokémon such as Farfetch’d, as well as the Pokémon Mr. Mime, which is a European-exclusive Pokémon. They will also give special 2km Eggs holding Pokémon not normally found in those eggs.
Source: Serebii
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