is there a shiny charm in pokemon let's go?
After you complete your Pokedex by capturing all 150 Pokémon, including Mewtwo, the Game Director in Celadon City will give you the Shiny Charm, which increases the odds of encountering a Shiny from 1 in 4,096 to 1 in 1,365 — making the odds at least three times more likely.