Special Raid Challenge

The Special Raid Challenge is a special event that is hosted during a three- or six-hour window and features a Pokémon as Raid Boss. This Pokémon may know one or more limited or legacy attacks and also have a chance to be shiny (evolved forms included). All Trainers will also receive up to five Raid Passes from Gyms at no cost. Gyms will stop other raids from happening roughly two hours before the start of event.

Trivia

 * Nidorino and Gengar Raid Day was canceled in Japan, South Korea and Italy due to the COVID-19 pandemic.
 * Mega Gyarados Raid Day in Evolving Stars was originally planned to start at 2 p.m. local time, but due to accidentally starting ahead of schedule in some regions, the start time was changed to 11 a.m. local time globally.
 * Hisuian Samurott Raid Day was extended for one hour due to server issues.