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.

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

These Pokémon had increased spawn rates in the wild and from Incense or Lure Modules in cities:

These Pokémon had increased spawn rates in the wild and from Incense or Lure Modules in forests:

These Pokémon had increased spawn rates in the wild and from Incense or Lure Modules near bodies of water:

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.