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 ...

The Rarest Generation Three Shiny Pokémon In Pokémon GO. Credit: Niantic 5. Shiny Beautifly & Dustox Beautifly and Dustox are the two possible third-stage evolutions of Wurmple, which has a ...

Every once in a while, Niantic will increase the Shiny encounter rates in Pokemon Go, making it somewhat easier to locate specific ones as part of an event. Such is the case right now in the game ...