An upcoming Pokemon GO Halloween event has been confirmed by the Pokemon Company. No specific details of what the event will bring have been confirmed yet.
“The Halloween season is a special time in Pokemon GO. Plenty of good stuff is coming to the game later this October, and we can’t wait to get out and about to see what sort of excitement we can scare up while catching new Pokemon to fill out our Pokedex. Stay tuned for more details about Pokemon GO’s Halloween event coming soon!”