Event Pokémon

This list includes every Event Pokémon which are specifically made for events with attributes closely related to the event theme. Both regular and shiny are obtainable only during certain events.
For a list of Pokémon forms that are recorded on the Pokédex, see List of Pokémon forms by release date.

Some event Pokémon are called costumed Pokémon and:

They are not recorded in Pokédex.
They can be seen in the bag by using costume filter.

Released event Pokémon

Pikachu family

Costume	Sprites	Event details
Festive		Available during Holiday event: December 25^th, 2016 to January 3^rd, 2017 December 21^st, 2017 to January 4^th, 2018 December 18^th, 2018 to January 2^nd, 2019 Festive Pichu was available since the second event. Shiny variant of whole family was available since the third event. Present was exclusive to Pikachu obtained during the second event.
Party hat		Available during selected Pokémon Day event: February 26^th to March 6^th, 2017 February 26^th to February 28^th, 2018 Party hat Pichu was available since the second event. Shiny variant of whole family was available since the second event. Present was exclusive to Pikachu obtained during the second event.
Ash hat		Available during 1st Anniversary event: June 6^th to June 27^th, 2017 Available in GO Snapshot during April 1^st to April 2^nd, 2019 Shiny variants of Pikachu and Raichu were available since GO Snapshot. Shiny variant of Pichu was not available.
Witch hat		Available during selected Halloween event: October 20^th to November 2^nd, 2017 October 23^rd to November 1^st, 2018 Shiny variant of whole family was available since the second event.
Summer		Available during 2nd Anniversary event: July 5^th to July 31^st, 2018 Shiny variant of whole family was not available.
Fragment hat		Available during October 6^th to October 7^th, 2018 Designed by Japanese streetwear designer Hiroshi Fujiwara. Sprite of Fragment hat Pichu does not exist.
Flower crown		Available during selected Pokémon Day event: February 26^th to February 28^th, 2019 Sprite of flower crown Pichu does not exist.
Detective		Available during the Detective Pikachu Celebration: May 7^th to May 17^thSprite of Detective Pichu does not exist.

Other Pokémon families

Pokémon family	Sprites	Event details
Delibird		Available during selected Holiday event: December 21^st, 2017 to January 4^th, 2018 December 18^th, 2018 to January 2^nd, 2019 Shiny variant of whole family was available since the second event. Recorded in Pokédex.
Sunglasses Squirtle		Available during the seventh Community Day on July 8^th, 2018 Encounter only by completing research task: Catch 5 Squirtle.
Heart pattern Spinda		Available during selected Valentine's Day event: February 13^th to February 21^st, 2019 Encounter only by completing research task: Make 5 Great Curveball throws in a row. Shiny variant was not available. After event, recorded in Pokédex as Pattern #9 form.
Flower crown Eevee		Available during selected Pokémon Day event: February 26^th to February 28^th, 2019

Unreleased event Pokémon

There are several event forms of Pokémon that were not released yet, among them there are:

shiny variants of some released Pikachu family members with event costumes,
flower crown Leafeon and Glaceon,
Pikachu family and Stantler with costumes seemingly related with winter and Christmas, possibly to be released in winter 2019.