https://www.polygon.com/2017/10/18/16496094/pokemon-go-gen-three-pokemon-latios-latias

Pokémon Go dataminers continue to find signs that the third generation of Pokémon is close to debuting in-game. A set of new details about them has been uncovered from recent update files — including a surprising, almost amusing error on Niantic’s part.

Members of The Silph Road have shared code that points to the gender ratios of every gen-three Pokémon. With many of them, the numbers are familiar; these ratios are typically identical to those from the traditional games. That means we can expect female starter Pokémon to be a lot more uncommon than male, for example.