Shiny Pokémon

Shiny Pokémon are Pokémon with a color variation that differs from their normal appearance. These color variations may range from minor hue adjustments to completely new palettes.

Background
Shiny Pokémon will have an aurora of stars floating around them. Players will not know that a Pokémon is shiny until they encounter it. Once a player captures a shiny Pokémon, their Pokédex will show that they have captured it.

Trivia

 * Magikarp, and its evolved form Gyarados, are the only Pokémon that have an available shiny form.
 * A shiny Pokémon may not appear shiny to nearby players.
 * Shiny Pokémon cannot be batch-transferred, and players will be notified if they try to transfer them.
 * In the main Pokémon series, the Gold and Silver versions were the first games to introduce shiny Pokémon.
 * A shiny Gyarados, located at the Lake of Rage, was the Pokémon used to introduce players to shiny Pokémon.
 * Shiny Pikachu began appearing on the first day of the Pokémon GO Park event, in Yokohama, Japan.