Shiny Whismur Pokémon Go will be easier to encounter during the Valentine's Day 2020 event. Here's how you can find a Shiny Whismur.
The Valentine's Day 2020 Event will run from 8 a.m. Feb. 14 to 10 p.m. Feb. 17 in your local time. During the event, pink-colored Pokémon will spawn more frequently. Although Wismur's is arguably closer to purple than pink, according to Niantic it's close enough to make it it eligible to be one of those Pokémon that you can find for Valentine's Day 2020.
Shiny Whismur Pokémon Go: How to Catch
While Shiny Whismur isn't featured explicitly, an increased chance of encountering Whismur in general will up your chances of finding a Shiny one. According to The Silph Road, Shiny Pokémon have an encounter rate of about one in 450. The event will not affect this number, but more chances of encountering Whismur will mean more chances to roll the dice for a Shiny.
Whismur's Shiny coloration has green accents on its ears and feet instead of yellow. If you encounter a Shiny Whismur, there will be a sparkle to show that it's the Shiny version.