The following Pokémon were released with the start of the event:
Selected Halloween-themed Pokémon had increased spawn rates in the wild and from Incense or Lure Modules:
These Shiny Pokémon were released with the start of the event:
2-km Pokémon Eggs obtained during the event would hatch more of these Pokémon:
These avatar items were released with the beginning of the event:
Shop special offer
The following offers were available from the shop from the start of the event.
Following promotional pictures were published by creators of the game across their social media channels.
- The Shiny Pokémon were released in parts:
- On October 20th, 2017 - Shiny Sableye began appearing on the first day of the Halloween event.
- On October 26th, 2017 - Shiny Duskull and Dusclops began appearing on the seventh day of the event. 
- On October 31st, 2017 - Shiny Shuppet and Banette began appearing on the twelfth day of the event.
- During this event , there were shiny forms of Gastly family members added to game data, although they weren't released to be caught in gameplay. 
- Shiny variants of family members of both Gastly and Misdreavus families were highly anticipated by players to appear during Halloween event in 2017 and later 2018, however neither of these Pokémon's shiny form were released then.
- Halloween treats coming to Pokémon GO!. Pokémon GO Live. Retrieved on 2017-10-19.
- HALLOWEEN EVENT BOXES IN POKEMON GO WHICH ONE SHOULD YOU BUY?. YouTube. Retrieved on 2018-12-17.
- Just caught a shiny Duskull. /r/TheSilphRoad. Retrieved on 2017-10-31.
- Shiny Shuppet is out!. /r/TheSilphRoad. Retrieved on 2017-11-01.
- Gastly family shiny 3D assets. /r/TheSilphRoad.