http://www.newsweek.com/pokemon-go-november-update-shedinja-1190280

Ahead of November, Niantic announced the special research tasks for the upcoming month and what Pokémon Go players can expect, including a chance to catch Shedinja and Shiny Caterpie.

Beginning Nov. 1, research tasks will shift from the Water types to the Bug types. Suicune will no longer be the Special Research encounter, and Shedinja the Bug and Ghost-type Pokémon will take its place. If you haven’t captured the Legendary Beast, you’ll only have until the first of the month to do so.