Can Marill be Shiny in Pokémon GO?
By Andrew Lin

Can Marill be Shiny in Pokémon Go? Marill itself was not previously available in the wild as a shiny, but players have reported encountering Shiny Marill in the wild during the Spring Event.
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Can Marill be Shiny in Pokémon GO?
Previously, the only way to get a Shiny Marill was to get a Shiny Azurill and evolve it. During the Spring Event, Marill has an increased spawn rate, and likewise more chances to get a Shiny.
The Go Battle Day will also feature Marill. On April 12 from 11 a.m. to 2 p.m. in your local time, Marill will be a guaranteed reward after your first and third wins. If you use the Premium Battle Pass, you'll get a Marill encounter after every win during the event time period. You could encounter a Shiny Marill here as well.
Shiny Marill is green instead of blue, so it should be easy to spot.