Part 1 of the Pokémon Go Winter Holiday event runs from Dec. 18-25 and part 2 runs from Dec. 25-31, with slight differences across them both.
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Pokémon GO Winter Holiday 2023 Part One
Pokémon Go Winter Holiday 2023 event guide : r/GamesAreLife
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Pokémon GO Winter Holiday 2023 Part One
Pokémon Go guide - Polygon