Duskull, the Hoenn Requiem Pokémon, can be found in the wild in Pokémon Go. Yes, Duskull can shine in Pokémon Go!
No member of the Duskull family sees any use in battle, although they do have a pretty good shiny version. Note that you need a Sinnoh Stone to turn Dusclops into Dusknoir.
What is Duskull'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. Duskull 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.