Feebas, the fish Pokémon from Hoenn, can be found in the wild in Pokémon Go. Yes, Feebas can be shiny in Pokémon Go!
To evolve Feebas into Milotic, you’ll need to your Feebas as your buddy and walk 20 km with it. After that, you can use 100 Feebas Candy to evolve it. It may seem like a lot, but since Pokémon Go has no beauty stat (or contest stats in general) nor does it have Prism Scales, this is what we get. :’(
What is the shiny rate for Feebas 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. According to a newer spreadsheet by some dedicated Silph researchers, Feebas is a confirmed Pokémon that gets a “permaboost” (meaning that it’s a rare spawn and thus gets a boosted shiny rate), so it spawns at a one in 64 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.