Kalos Celebration Event

Kalos Celebration Event was an event in Pokémon GO to celebrate the release of the Kalos Region. It was a part of the Pokémon GO's first Season: Season of Celebration. It was announced on the update GO Beyond.

Features
Every spin from PokéStops gave at least four Items, with high rate of Poké Balls.

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

A region-exclusive Pokémon was introduced.

These Raid Bosses were available during the event:

Field Research event tasks
These Field Research tasks were available during the event:

Timed Research
Kalos Celebration Event Timed Research was available during the event:

Controversy
Although the officials had claimed an increase of Kalos Pokémon in the wild, many players found out the low spawn rate of them, especially the Starters. Incense did not help either. Players had expressed concern of not able to complete the Timed Research due to the absurdly low appearance of the required Pokémon, with Froakie being the most severe case. It is presumably because the extreme popularity of Froakie's final evolution - Greninja compared with the other two.