The Halloween Event was an event in October 2016. It began on 13th October 2016.
You could find an NPC named 'The Headless Horseman', who would appear in a random route on the map occasionally. His arrival would be announced in chat.
When interacted with, he would offer you a choice of 3 Pokemon for him to summon. The Pokemon which you could choose from were Chatot, Poochyena, and Darumaka.
Currently, they are only obtainable only by Roulette or trading.
|10 October, 2016||Code: "Totally" - Gave Totodile|
|13 October, 2016||Halloween Event is declared on Twitter.
The event begins on this day.
|16 October, 2016||Community group hits 700k members.|
|31 October, 2016||This day was Halloween.|
|1 November, 2016||The Halloween Event officially ends.|