Like most games, Pokémon GO runs various special events and in these events, many of the mechanics and systems alter sightly in order to provide a different themed experience.

Halloween 2016
Release Dates:

October 26th 2016 - November 1st 2016

This promotion is to celebrate Halloween and as such, it alters the mechanics to tie in with the concept of Trick or Treating

Changes
  • The following Pokémon will appear more:
    • Zubat
    • Golbat
    • Drowzee
    • Hypno
    • Gastly
    • Haunter
    • Gengar
  • Candy from captures is increased from 3 to 6
  • Candy from transfers is increased from 1 to 2
  • Candy from Buddy Pokémon appear four times as often
Thanksgiving 2016
Release Dates:

November 23rd 2016 - November 30th 2016

This promotion is to celebrate Thanksgiving and as such, it doubled experience gained throughout the game

Christmas 2016
Release Dates:

December 12th 2016 - December 29th 2016

This promotion is to celebrate Christmas and coincided with the release of the first Johto Pokémon into the game. This event has Pikachu appear with a special festive hat. This hat remains on the Pokémon and even remains on it when it evolves into Raichu

Christmas 2016
Release Dates:

December 25th 2016 - January 3rd 2017
December 30th 2016 - January 8th 2017

A second promotion to celebrate Christmashappened with two different events running concurrently. From December 25th to January 3rd, there will be a higher chance of Pokémon from Johto appearing as Eggs from Poké Stops. In addition to this, you're guaranteed one incubator. In addition to this, from December 30th through January 8th, the Kanto starters will have a higher chance of appearing and Lure Modules will last 60 minutes.

Valentine's Day 2017
Release Dates:

February 8th 2017 - February 15th 2017

To promote Valentine's Day, there is a special event which alters a few things. First, all candy obtained in the event is doubled, and Buddy Pokémon will find candy twice as fast. Next, Pink Pokémon such as Chansey and Clefable are found more commonly in the wild while Igglybuff, Smoochum and Cleffa will be more common in Eggs found during this period.

Changes
  • The following Pokémon will appear more:
    • Clefairy
    • Clefable
    • Jigglypuff
    • Wigglytuff
    • Slowpoke
    • Slowbro
    • Exeggcute
    • Lickitung
    • Chansey
    • Porygon
  • The following Pokémon will hatch more:
    • Cleffa
    • Igglybuff
    • Smoochum
  • Candy from captures is increased from 3 to 6
  • Candy from transfers is increased from 1 to 2
  • Candy from Buddy Pokémon appear two times as often
Water Festival 2017
Release Dates:

March 22nd 2017 - March 29th 2017

As part of the promotion of Water Festival, all Water-type Pokémon became far more common during this event. In addition to that, Shiny Magikarp could be found.

A special Magikarp hat was also given to all Pokémon GO players

Easter Eggstravaganza 2017
Release Dates:

April 13th 2017 - April 20th 2017

This event has double experience gained, and Lucky Eggs are 50% cheaper. In addition to that, far more Pokémon will be available in 2km Eggs for the duration of the event and candy yields from eggs are higher.

Grass Event 2017
Release Dates:

May 5th 2017 - May 8th 2017

For one weekend only, Grass-type Pokémon were made to be more common. During this event, Lure Modules also had an increase, working for 6 hours rather than the usual 30 minutes..

Adventure Week 2017
Release Dates:

May 18th 2017 - May 25th 2017

For one week, the special Pokémon GO Adventure Week competition. In this event, Rock-type Pokémon are more common, more items will be rewarded on PokéStops, Poké Balls are 50% cheaper, and finally your Buddy Pokémon Candy 4 times as fast

A special Magikarp hat was also given to all Pokémon GO players

 
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