When is Shiny Shadow Mewtwo coming to Pokemon GO?

Pokemon GO recently introduced the ability to catch shiny variants of Shadow Pokemon. It now appears that this capability will broaden to legendary creatures due to the arrival of the new Shadow Raids.

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Hatch Strange Eggs, Rescue Shadow Mewtwo, and Catch Shiny Shadow

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Catching Shadow Mewtwo, Victini, Shadow Shiny Lapras, 100% Gible

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Conta Pokémon Go - Shiny Shadow Mewtwo - Pokemon GO - GGMAX

Shadow Raids bring a dark twist and Shiny Shadow Mewtwo to Pokémon