Let's Go Celebration

Let's Go Celebration was an event in Pokémon GO that promoted the release of Nintendo Switch games Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!. It featured spawns and field research centered around Pokémon originally discovered in the Kanto region, including the new Mythical Pokémon Meltan.

Features
Pokémon originally discovered in the Kanto region were seen more frequently. Field Research tasks highlighting Kanto Pokémon and Special Research featuring Meltan were made available. Slugma, Gulpin and Anorith also appeared more to help Trainers complete research.

Moreover, these Shiny Pokémon were released at the start of the event.

Raid Bosses
The following tier three Raid Bosses were featured from November to November, with the possibility of acquiring a shiny Alolan Raichu.

Field Research event tasks
There were several Field Research tasks available exclusively during the Let's Go Celebration. There was a possibility to encounter shiny variant of Aerodactyl as the reward for these tasks. These tasks served as a help towards completing some Special Research tasks of Let's Go, Meltan tasks series.

Special research tasks
There is a nine-part Special Research quest called Let's GO, Meltan.

Trivia

 * It was one of three events that revolved around the Kanto-region Pokémon in particular, the first two ones were the Kanto Celebration and Ultra Bonus Event.