On Jan. 7, Niantic brought the color swapping Pokémon to the popular mobile AR game — but you won't be able to locate it in the wild like most other Pokémon.
In the press announcement on Niantic's official Pokémon GO site, the developers only provided players with a hint on where to find Kecleon. A photo of a trainer next to a PokéStop was attached to the press release, captioned "There’s a Kecleon hiding in this image!" There are no Pokémon or other landmarks in the image.
Players are able to find Kecleon exclusively at PokéStops, though you may not notice them right away. When spinning a PokéStop, you'll know you've found a Kecleon if you receive the message "There's an invisible obstacle in your way. It's preventing you from collecting items..."
On the backside of the PokéStop, Kecleon will be in its invisible form. Once you've found the chameleon Pokémon, you'll be able to begin your encounter with it.
Thankfully, there's nothing else particularly special about these encounters — they work just the same as all other encounters in the game. Be sure to use berries if you're having issues capturing it to increase your chances, and practice your excellent throws when you can.
If you want to catch multiple Kecleon, you'll have to visit multiple PokéStops to find more, though it won't be at every PokéStop you visit.