Roselia, the Hoenn thorn Pokémon, can be found in the wild in Pokémon Go. Yes, Roselia can shine on Pokémon Go!
Roserade is actually a really good grass and poison type attacker, so it's worth grabbing a powerful one if you can. If you already have a shiny Roselia (or any of its relatives), it is probably from a previous Roselia Community Day event that took place in February 2021.
What is Roselia's shine rate in Pokémon Go?
According to old research by the now-defunct website The Silph Road (via Wayback Machine), the shine rate of Pokémon on a typical day is about one in 500. Roselia is not a confirmed Pokémon that gets a “permanent boost.” ” (meaning it is a rare spawn and therefore gets an improved shine rate).
What can I do to attract more shiny Pokémon?
Unfortunately, not much. It seems to be a coincidence. Shiny Pokémon catch rates are set by developer Niantic and usually only increase during special events like Community Days or Safari Zones, or in legendary raids. There are no consumable items that increase Shiny Pokémon rates.