Pokémon Forms have been a part of Pokémon since the release of Pokémon Gold & Silver and Pokémon GO has now started to propogate through Pokémon GO. This page is to detail the different kinds of forms, as well as any unique features.

Gender Differences

Gender differences were first introduced in Pokémon Diamond & Pearl, but as of Pokémon GO Version 1.27.2/0.57, gender has now become a factor into Pokémon. Most Pokémon have a gender, though some are exclusively male, exclusively female, and some lack a gender. There are, however, multiple Pokémon that have different appearances based on gender. These are purely aesthetic differences and appear in all facets of the game, but if you caught them before the update to Version 1.27.2, they will appear as male only..

Male Female
Male Female

The following Pokémon have gender differences: Venusaur, Butterfree, Rattata, Raticate, Pikachu, Raichu, Zubat, Golbat, Gloom, Vileplume, Kadabra, Alakazam, Doduo, Dodrio, Hypno, Rhyhorn, Rhydon, Goldeen, Seaking, Scyther, Magikarp, Gyarados, Meganium, Ledyba, Ledian, Xatu, Sudowoodo, Politoed, Aipom, Wooper, Quagsire, Murkrow, Wobbuffet, Girafarig, Gligar, Steelix, Scizor, Heracross, Sneasel, Ursaring, Piloswine, Octillery, Houndoom, Donphan, Torchic, Combusken, Blaziken, Beautifly, Dustox, Ludicolo, Nuzleaf, Shiftry, Meditite, Medicham, Roselia, Gulpin, Swalot, Numel, Camerupt, Cacturne, Milotic & Relicanth

Alola Forms

Alolan Forms were introduced in Pokémon Sun & Moon. In Pokémon GO, these Pokémon only appear during special Events or when you receive a 7km egg from a friend through Gifts. These Pokémon have different forms and

Rattata
Raticate
Raichu
Sandshrew
Sandslash
Vulpix
Ninetales
Diglett
Dugtrio
Meowth
Persian
Geodude
Graveler
Golem
Grimer
Muk
Exeggutor
Marowak
#201 Unown

Unown is one of the more unusual Pokémon with there being a total of 28 different forms. These forms take the appearance of the English alphabet, as well as an ! and ? Unown. These are determined randomly when Unown appears in Pokémon GO.

Not much differs between the Unown, but there is a special medal for collecting them.

#351 Castform

Castform is a unique Pokémon in that it has forms that change depending upon weather. While in the main games, your Castform would change form in battle based on the weather, in Pokémon GO it is a bit different in that it is based on the weather you encounter it in and will not change after capture

NormalSunny FormRainy FormSnowy Form
Cloudy
Partly Cloudy
Windy
ClearRainSnow
Foggy
Special Events

The Christmas 2016 event introduced another version of Pokémon forms, special costumes for Pokémon. In this case, throughout the event Pikachu with a Christmas hat was seen in the wild for the duration of the event. This Pikachu was just like any normal Pikachu but wore a special hat, and kept the hat after the event. In addition to this, the hat was retained when Pikachu evolved into Raichu. This was then repeated for Pokémon's 21st birthday. On Pokémon GO's 1st anniversary, Pikachu was then given with Ash's hat from the original anime series. Raichu also could have the hat, but this time Pichu was also included. Hatched Pichu would have the hat. As of the July 2018 Community Day, Squirtle as also added to the possibilities

Pichu Pikachu Raichu
Male Male Female
  Male Female
Pichu Pikachu Raichu
Pichu Pikachu Raichu
Pichu Pikachu Raichu
Squirtle Wartortle Blastoise
Squirtle Wartortle Blastoise
 
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