https://pokemongolive.com/en/post/dec18-cd/so this event is starting today in Pokémon GO. any Pokémon in pic related will have a shiny boosted chance for the weekend. related because you can transfer from GO to Let’s Go
if you’re new and decide to take this on as an option, go to your local area with a lot of poke stops so you can get all the poke balls, and keep in mind Pokémon don’t appear shiny in the overworld, so you have to click on them and check for shiny. happy hunting