https://www.polygon.com/2017/12/6/16739442/pokemon-go-generation-3-update-weather-update >There are 50 more third-gen Pokémon to collect in Pokémon Go as of its latest update, and with them comes an entirely new game mechanic. Niantic has added a dynamic weather system, which impacts the kinds of Pokémon you can find and battle buffs you’ll receive based on what the weather’s like outside. >Among the Pokémon now available are Treecko, Torchic and Mudkip, the three starter Pokémon from the third-generation games Pokémon Ruby and Sapphire. They’re joined by a variety of normal- and grass-type monsters, as well as other Pokémon from the Hoenn region that will be most common during particular weather conditions.