Pokémon sleep is developed, or probably still being developed by the Select Button developer. This is currently under development with assistance from Niantic, the Pokémon Go developer. The Pokémon Go developer, Niantic, had been on the working lane since 2010 in a cocoon world of Google. It started as in form of a Niantic lab, and the company finally gained independent in the month of October, 2015. Since then they have grown and spread wings across a few areas, earning some cool achievements for them.
The company has its offices in Los Angeles, Hong Kong, London, Bellevue, Sunnyvale, and Tokyo and in San Francisco. However, the company is based in San Francisco in the United States of America and is well known to have developed some augmented reality games, even for smartphones. The popular games they have developed include the Harry Potter: Wizards Unite, Ingress, and Pokémon Go. The Select Button, however, is a unique developing entity.