Notably, the Therian Formes of the Forces of Nature, Tornadus, Landorus, and Thundurus, will be coming to the game. Niantic did note that more Legendary Pokémon would be making their debuts as well. It’s likely that we’ll start seeing some Legendary Pokémon from the Kalos region, like Xerneas and Yvetal, soon.
More Mega Evolved Pokémon will also be making their debut during this season, though there were no specifics given about which ones.
Different Pokémon will also be spawning in the different hemispheres as the seasons change. Most notably, players in the Northern Hemisphere will be able to find the spring version of Deerling, and players in the Southern Hemisphere will be able to find the fall version.
The season will begin on March 1 and last until June 1, with perks like increased XP gained from doing five-star raids. The last season focused on “celebration,” and included different events each week focusing on the various regions in Pokémon, increasing the spawn rates of Pokémon from the respective regions.