Sableye, the darkness Pokémon from Hoenn, can be found in the wild in Pokémon Go. Yes, Sableye can be shiny in Pokémon Go!
Unfortunately, even with its Mega Evolution, Sableye won’t see much use in the game. It is a great shiny, though. The swap from the red rubies to the green emeralds is giving a little bit of “Finn from Adventure Time finds out he’s colorblind.”
What is the shiny rate for Sableye in Pokémon Go?
As per old research by the now-defunct website The Silph Road (via Wayback Machine), the shiny rate for Pokémon on a regular day is approximately one in 500. Sableye is not a confirmed Pokémon that gets a “permaboost” (meaning that it’s a rare spawn and thus gets a boosted shiny rate).
What can I do to attract more shiny Pokémon?
Not much, unfortunately. It appears to be random chance. Shiny Pokémon catch rates are set by developer Niantic, and they are typically only boosted during special events like Community Days or Safari Zones, or in Legendary Raids. There are no consumable items that boost shiny Pokémon rates.