Combee, Sinnoh's little bee Pokémon, can be found in the wild in Pokémon Go. Yes, Combee can shine in Pokémon Go!
Vespiquen doesn't see much use in PvP or raids. Notably, only the female Combee can evolve into Vespiquen, so you'll want to make sure yours has the orange-red diamond in the middle of her head before you get your hopes up about her evolution.
What is Combee'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. Combee is not a confirmed Pokémon to get 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.