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From Jan. 5 until Jan. 10, Pokémon Go is hosting an Unova event that increases the spawn rate of the Pokémon from that region, as well as introducing Shiny Snivy.

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Pokémon Go Holiday 2020 event guide: Field Research and rewards - Polygon

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Pokémon Go An Instinctive Hero event field research tasks

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Pokémon Go Unova Collection Challenge: How to complete the Collection Challenge and Unova Celebration event field research tasks

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