Halloween

Halloween is a seasonal event in Pokémon GO that takes place in the latter half of October. It is the in-game counterpart of.

Background
This event took place between October 26th to November 1st.

Trainers received double Candy for catching, hatching, and transferring Pokémon. The required Buddy distance was reduced by a quarter. This meant that Pokémon received Candy four times faster.

Trainers saw an increased spawn rate for scary Pokémon. These Pokémon included: Zubat, Golbat, Gastly, Haunter, Gengar, Drowzee, Hypno, Cubone, and Marowak.

Trivia

 * It is hinted that there will be a second Halloween event happening later in October 2017; which mentions that there may be new Pokémon available.