According to Deadline, Chronicle writer Max Landis is favourite to write the screenplay, but no director is yet attached. It’s not the first on-screen rodeo for Pokémon, with at least twelve films produced since the audaciously-titled Pokémon: The First Movie. Any opportunity to turn the series into a lucrative cinematic franchise would be hungrily accepted by any studio.

http://www.empireonline.com/movies/pokemon-first-movie/pokemon-go-movie/