Season of Legends

Season of Legends was the second Season in Pokémon GO.

This season featured the debut of several Legendary Pokémon, including Therian Forme of Tornadus, Thundurus, and Landorus, Xerneas and Yveltal. Pokémon would be appearing in different habitats in the wild. For example, Trainers might find Mantine or Frillish appearing near water, Voltorb or Glameow while in the city. This season also features Hemisphere-exclusive Pokémon, Season-exclusive Special Research, Egg changes, increased XP from five-star raids, and free Remote Raid Passes.

Featured Pokémon
These Pokémon were released at the start of the Season:

These Shiny Pokémon were released at the start of the Season: PS Landorus

Spring-themed Pokémon had increased spawn rates in the wild and from Incense or Lure Modules in the northern hemisphere:

Autumn-themed Pokémon had increased spawn rates in the wild and from Incense or Lure Modules in the southern hemisphere:

Special Research
Season of Legends Special Research was available since March :

List of Season of Legends Events
During this Season, there were 19 events, 2 of them being regional.

Trivia

 * Several Pokémon received buffs of their catch rates with at start of the Season of Legends.