The Legendary Pokémon Xerneas and Yveltal make their Pokémon GO debuts during an eventful May! - Pokémon GO
This month, Giovanni will have Shadow Moltres in his grasp! If you haven’t already, complete the latest Team GO Rocket Special Research, The Higher They Fly..., to earn a Super Rocket Radar. This will help you track down the Team GO Rocket Boss and save Shadow Moltres! You can also receive a Super Rocket Radar from Timed Research that’ll be available during the Luminous Legends X event.
Luminous Legends X: Xerneas makes its Pokémon GO debut alongside Dragon- and Fairy-type Pokémon originally discovered in the Kalos region! - Pokémon GO
A legend will soon illuminate our world: Xerneas, the Life Pokémon, will make its Pokémon GO debut during the Luminous Legends X event! Some Dragon- and Fairy-type Pokémon originally discovered in the Kalos region will be coming along for the journey as well, such as Spritzee, Swirlix, and Goomy! A new item will also be coming to Pokémon GO—the Rainy Lure Module, which can be used to evolve Sliggoo (the Evolution of Goomy) into Goodra. You can also evolve Sliggoo when the in-game weather is rainy.