Recolored Pokemon (also known as recolors, alternate forms, special auras or new auras) are a cosmetic feature which solely change the Pokemon's sprite. They are a type of aura with rarity 1/130. It was a feature first implemented in v.1.9.0 debuting Chrome Groudon, Abyss Kyogre and Chill Rayquaza.
They are much easier to find than other aura types with a probability of 1/200 to be encountered (There have been several times when Wish increased the chances to 1/150.). Recolored Pokemon can also have a ring aura in addition to the recolor, but never can have a tint. Below is a work-in-progress gallery of all recolors in Project: Pokemon.
Use Ctrl+F to find the recolor you would like to see. If it has been excluded, it may be added over time.