Mega Raid Challenge

Mega Raid Challenge was an event in Pokémon GO that occured in the first week of September 2020, as part of Mega September event series.

Features
Following Friendship attack bonuses were applied in Raids during this event:

Featured Pokémon
Mega Pidgeot was unlocked on September after Trainers had won 2 million Mega Raids.

PS Pidgeot

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

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

Avatar items
These avatar items were released with the beginning of the event:

Shop special offer
A one-time purchase bundle of Remote Raid Pass was available from the start of the event.

Trivia

 * The official blog made an announcement of shiny Lotad, which is done for new-released Shiny Pokémon. However, shiny Lotad had already been released in March 2019 Limited Research.