Event Pokémon

For clarity purpose, this list doesn't include:
 * Pokémon forms, both regular and shiny, that are recorded on the Pokédex.
 * Pokémon gender differences.

December 25th
Pikachu wearing Christmas hat was released during the 2016 Holiday event. Regular (2) =

February 26th
Pikachu wearing party hat was released during the 2017 Pokémon Day. Regular (2) =

June 6th
Pikachu family wearing Ash's hat was released during the 1st Anniversary event. Regular (3) =

October 20th
Pikachu family wearing a witch hat was released during the 2017 Halloween event. Regular (3) =

December 21th
Pichu wearing Christmas hat was released during the 2017 Holiday event. Regular (1) =

February 26th
Pichu wearing party hat was released during the 2018 Pokémon Day. Shiny forms wearing party hat became obtainable for the first time. Regular (1) = Shiny (3) =

July 6th
Pikachu family in summer style (wearing sunglasses and a beach hat) was released during the 2nd Anniversary event. Regular (3) = Shiny (3) =

July 8th
Squirtle with sunglasses was released by completing research tasks during the seventh Community Day. Regular (3) = Shiny (3) =

October 5th
Pikachu family wearing a black hat was released during retail festival called 'HypeFest'. Regular (2) = Shiny (2) =

October 20th
Shiny Pikachu family wearing a witch hat was released during the 2018 Halloween event. Regular (3) =

December 18th
Shiny Pikachu family wearing Christmas hat was released during the 2018 Holiday event. Shiny (3) =

February 13th
Spinda with heart-shaped pattern was released by completing research tasks during the 2019 Valentine's Day Regular (1) =

February 26th
Eevee and Pikachu wearing flower crowns were released during the 2019 Pokémon Day Regular (8) = Shiny (8) =

Unreleased or unavailable
Regular (5) = Shiny (8) =