Rivals' Week

Rivals' Week is an event in Pokémon GO.

Features
The following Pokémon were released with the start of the event:

Select Pokémon had increased spawn rates in the wild and from Incense or Lure Modules. Zangoose and Seviper appeared worldwide.

5-km Pokémon Eggs obtained during the event would hatch more of these Pokémon:

The following Raid Bosses were available for a time of this event:

Field Research event tasks
There were several Field Research tasks exclusively for the duration of the event.