Pokémon is all about collecting an entire region’s worth of pocket creatures, adding them to your ranks, and battling against other trainers to make them stronger. A key thing about the collection process is acquiring shiny versions, and some trainers eek them out purely for that.
In Pokémon Go, not every Pokémon has its shiny version, even if the Pokémon has been in the game for a reasonable amount of time. It varies when the developer Niantic releases them.
Read more on gamepur.com