Costume Pokémon – what exactly does that mean? Well in the case of Pokémon Go this means a Pokémon that is wearing some sort of accessory giving it a slightly different visual appearance. In contrast to different Pokémon Forms, Costume Pokémon don’t receive any stat changes from the added accessory.

Over the history of Pokémon Go, there have been numerous events featuring Costumed Pokémon. Below is a running list of these Pokémon.

PRO TIP: The in-game search tool allows the use of ‘costume’ to return all Costumed Pokémon in your box.

Squirtle Squad
Squirtle Community Day – July 8th, 2018
Shiny Released — Only available through Research Task (Catch 5 Squirtle)
Normal Squirtle Squad Wartortle Squirtle Squad Blastoise
Shiny Squirtle Squad Shiny Squirtle Squirtle Squad Shiny Wartortle Squirtle Squad Blastoise


Santa Hat
December 25th, 2016 – January 3rd, 2017 – Pichu Released
December 21st, 2017 – January 4th, 2018 – Shiny Released
December 18th, 2018 – January 2nd, 2019 – Shiny Pichu Released
Day 1 of Yokohama Go Fest 2019
Normal
Shiny


Party Hat
February 26th – March 6th, 2017 – Shiny Released
February 26th – February 28th, 2018 – Pichu and Shiny Pichu Released
June 28th – July 6th, 2018
Pikachu only available through Photo Bomb (1 per day), Pichu available in Eggs
Day 2 of Yokohama Go Fest 2019
Normal
Shiny


Ash Hat
June 6th – June 27th, 2017 – Pichu Released
April 1st & 2nd, 2019 – Shiny Released. Shiny Pichu NOT Released
Only available through Photo Bomb (5 per day)
Day 3 of Yokohama Go Fest 2019 – Shiny Pichu Released
Normal
Shiny


Witch Hat
October 20th – November 2nd, 2017 – Pichu Released
October 23rd – November 1st, 2018 – Shiny Released. Shiny Pichu Released
Day 4 of Yokohama Go Fest 2019
Normal
Shiny


Summer Hat
July 6th – July 31st, 2018 – Shiny NOT Released. Pichu Released
Day 5 of Yokohama Go Fest 2019 – Shiny Released
Normal
Shiny

Fragment Hat
October 6th & 7th, 2018 – Shiny Released. Pichu NOT Released
Normal
Shiny


Flower Crown
February 26th – February 28th, 2019 – Shiny Released. Pichu NOT Released
Also Available to all Attendees of the
2019 Go Fest Events (Chicago & Dortmund)
Day 6 of Yokohama Go Fest 2019
Normal
Shiny


Flower Crown
February 26th – February 28th, 2019 – Shiny Released.
Also Available to all Attendees of the
2019 Go Fest Events (Chicago, Dortmund, & Yokohama*)
Normal
Shiny


Detective Hat
May 7th – May 17th, 2019 – Shiny NOT Released. Pichu NOT Released.
Only available through Photo Bomb (1 per day)
Day 7 of & Day After Yokohama Go Fest 2019
Normal


Straw Hat
July 22nd – July 29th, 2019 – Shiny Released. Pichu NOT Released. Raichu NOT Available.
Normal
Shiny

GO Fest Yokohama/Pikachu Outbreak 2019

GO Fest Yokohama/Pikachu Outbreak brought back several costumed Pikachu for everyone over the event duration! The Costume changed each day at 10 am JST (UTC+9:00).

Per the official Tweet:

Surprise, Trainers! We’ve invited some familiar guests to Yokohama for our last Pokémon GO Fest this year! From August 6 at 10 a.m. JST to August 12 at 5 p.m. JST, Pikachu will be appearing globally, wearing a different hat each day!