Yes, you can find shiny Yamask in Pokémon Go
Source:https://www.polygon.com/pokemon-go-guide/23889476/can-yamask-be-shiny-cofagrigusYes, you can find shiny Yamask in Pokémon Go
Source:https://www.polygon.com/pokemon-go-guide/23889476/can-yamask-be-shiny-cofagrigus