Mega Buddy Challenge

Mega Buddy Challenge is an event in Pokémon GO that occurs in the third week of September 2020, as part of Mega September event series.

Features
Selected large-sized Pokémon have increased spawn rates in the wild and from Incense or Lure Modules:

These Shiny Pokémon were released with the start of the event: PS Doduo PS Dodrio

There is also one chance per day to be photobombed by these Pokémon:

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

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

Timed Research
During this event there was a Timed Research series that was titled Mega Buddy Challenge in game. A total of 135 Beedrill Mega Energy could be obtained for completing it.

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

Trivia

 * The official blog stated surprise encounters would only occur for Mega-Evolved Buddy. However, it could happen with any snapshots, including Pokémon not assigning to Buddy.