Yes, you can find shiny Hoppip in Pokémon Go
I FINALLY GET ONE!!! Pokémon GO Around The World Shiny Hoppip!
Hoppip, the cottonweed Pokémon from Johto, is found in the wild in Pokémon Go. Yes, Hoppip can be shiny in Pokemon Go!
Hoppip and its evolution were actually shown at a Community Day in February 2022. If you already have lots of shiny Hoppip, it's probably from there.
According to old research from the now-defunct website The Silph Road (via the Wayback Machine), the shiny speed of Pokemon on a typical day is about one in 500. Hoppip is not a confirmed Pokemon that gets a "permaboost" (meaning it's a rare spawn and thus gain a boosted shine rate).
