Pokémon Go's Halloween event brings Shiny Spiritomb, Galarian

Pokémon Go’s Halloween event will start on Oct. 23. More ghost-types will spawn, Mega Gengar and Galarian Yamask will join the game, and all candy gains will be doubled.

Halloween 2021 Event Speculation

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THE BEST EVENT OF THE YEAR! *HALLOWEEN 2020* - SHINY SPIRITOMB, GALARIAN YAMASK & MORE!

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Pokémon GO Halloween Event 2020

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Pokemon GO Halloween Campaign Announced, All Gen 3 Pokemon Releasing By December – NintendoSoup