Special Raid Event

Special Raid Event, includes Week or Weekend, is an irregular event that is hosted during a short period of time and features a returning Legendary Raid Boss which may have a chance to be shiny.

This event format may have been discontinued by Niantic as Raid Boss changes are less fixed format nowadays.

Trivia

 * Darkrai and Giratina events in March, 2020 were canceled in Japan, South Korea and Italy due to the COVID-19 pandemic.
 * Due to the same pandemic, Cobalion event in March, 2020 was extended from 20-23 to 17-31. Lugia event first extended, then canceled worldwide.