List of Pokémon with different forms

Some Pokémon of the same species may appear in different forms due to weather conditions, being from different regions, or other reasons. The difference between forms of a Pokémon species may be only visual, but can also present different evolution options, availability, types, moves, base stats and height and weight. Different forms are recorded in the corresponding Pokédex entry under different Pokémon form switches.

Alolan forms
There are certain Kanto-region Pokémon that have different forms as they inhabit the Alola region. Alolan forms are different in availability, types, moves and stats.

Regular=

Shiny= PS Rattata PS Rattata PS Raticate PS Raticate PS Raichu PS Raichu PS Sandshrew PS Sandshrew PS Sandslash PS Sandslash PS Vulpix PS Vulpix PS Ninetales PS Ninetales PS Diglett PS Diglett PS Dugtrio PS Dugtrio PS Meowth PS Meowth PS Persian PS Persian PS Geodude PS Geodude PS Graveler PS Graveler PS Golem PS Golem PS Grimer PS Grimer PS Muk PS Muk PS Exeggutor PS Exeggutor PS Marowak PS Marowak

Galarian forms
There are certain Pokémon that have different forms as they inhabit the Galar region. Galarian forms are different in availability, types, moves and stats. Galarian Corsola has not been released yet. Regular=

Shiny= PS Meowth PS Meowth PS Ponyta PS Ponyta PS Rapidash PS Rapidash PS Slowpoke PS Slowpoke PS Slowbro PS Slowbro PS Farfetch'd PS Farfetch'd PS Weezing PS Weezing PS Mr. Mime PS Mr. Mime PS Slowking PS Slowking PS Corsola PS Corsola PS Zigzagoon PS Zigzagoon PS Linoone PS Linoone PS Darumaka PS Darumaka PS Darmanitan PS Darmanitan PS Darmanitan PS Darmanitan PS Yamask PS Yamask PS Stunfisk PS Stunfisk

Hisuian forms
There are certain Pokémon that have different forms as they inhabit the Hisui region. Hisuian forms are different in availability, types, moves and stats.

Regular=

Shiny= PS Voltorb PS Voltorb PS Electrode PS Electrode

Unown
Unown has twenty eight different forms, being the difference only visual. Each of these forms resembles letter of Latin alphabet with addition of exclamation (!) and question (?) marks. Unown Pokédex entry has custom form switches. Regular=

Shiny= PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown PS Unown Pokédex switch=

Spinda
Spinda has twenty different patterns, being the difference only visual. Spinda patterns differ in regular and shiny variants. 9 Spinda patterns have been released so far. Spinda Pokédex entry has custom form switches. Regular=

Shiny= PS Spinda PS Spinda PS Spinda PS Spinda PS Spinda PS Spinda PS Spinda PS Spinda PS Spinda Pokédex switch=

Castform
Castform has four different forms, varying in types and moves. Each of these forms spawns in specific weather conditions. Regular=

Shiny= PS Castform PS Castform PS Castform PS Castform

Deoxys
Deoxys has four different forms, varying in stats and moves. Regular=

Shiny= PS Deoxys PS Deoxys PS Deoxys PS Deoxys

Burmy and Wormadam
Burmy and Wormadam have three different forms named cloaks. While Wormadam forms differs for its type, Burmy forms differ only with appearance of its cloak. Regular=

Shiny= PS Burmy PS Wormadam PS Burmy PS Wormadam PS Burmy PS Wormadam

Cherrim
Cherrim has two different forms, being the difference only visual. Sunshine form Cherrim spawns during sunny weather whilst Overcast form Cherrim spawns during every else weather condition. Regular=

Shiny= PS Cherrim PS Cherrim

Shellos and Gastrodon
Shellos and Gastrodon have two different forms, being the difference only visual. West Sea form is available on the West Hemisphere and East Sea form is available on the East Hemisphere. Regular=

Shiny= PS Shellos PS Gastrodon PS Shellos PS Gastrodon

Rotom
Rotom has six different forms, varying in types and moves. Rotom Pokédex entry has custom form switches. Regular=

Shiny= PS Rotom PS Rotom PS Rotom PS Rotom PS Rotom PS Rotom Pokédex switch=

Giratina
Giratina has two different forms, being the difference only in stats. Altered Forme is more defense-oriented while Origin Forme is more offense-oriented. Regular=

Shiny= PS Giratina PS Giratina

Shaymin
Shaymin has two different forms, varying in types. Regular=

Shiny= PS Shaymin PS Shaymin

Arceus
Arceus has eighteen different forms depending on its type. Regular=

Shiny= PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus PS Arceus

Basculin
Basculin has two different forms, being the difference only visual. Red-Striped form is available on the West Hemisphere and Blue-Striped form is available on the East Hemisphere. Regular=

Shiny= PS Basculin PS Basculin

Darmanitan
Besides its Galarian form, Darmanitan has two different forms, being the difference only visual. Zen Mode one is not available currently. Regular=

Shiny= PS Darmanitan PS Darmanitan

Deerling and Sawsbuck
Deerling and Sawsbuck have four different forms, being the difference only visual, one for each season of the year. Availability depends on the current Season. Regular=

Shiny= PS Deerling PS Deerling PS Deerling PS Deerling PS Sawsbuck PS Sawsbuck PS Sawsbuck PS Sawsbuck

Forces of Nature
Each member of Forces of Nature has two distinct forms - Incarnate Forme and Therian Forme that differ in stats. Regular=

Shiny= PS Tornadus PS Tornadus PS Thundurus PS Thundurus PS Landorus PS Landorus

Kyurem
Kyurem has three different forms, varying in stats and moves. Regular=

Shiny= PS Kyurem PS Kyurem PS Kyurem

Keldeo
Keldeo has two different forms namely Ordinary and Resolute formes. Regular=

Shiny= PS Keldeo PS Keldeo

Meloetta
Meloetta has two different forms, varying in stats, moves and types. Regular=

Shiny= PS Meloetta (Normal) PS Meloetta (Normal)

Genesect
Genesect has five different forms depending on the drive it is using. Genesect Pokédex entry has custom form switches. Regular=

Shiny= PS Genesect PS Genesect PS Genesect PS Genesect PS Genesect Pokédex switch=

Greninja
Greninja has two different forms. Only one has been released yet. Regular=

Shiny= PS Greninja

Vivillon
Vivillon has twenty different forms.

Flabébé, Floette, and Florges
Flabébé, Floette, and Florges have five different forms.

Furfrou
Furfrou has ten different forms, being the difference only visual. Only Natural Trim can be caught and can be changed through the Form-change Mechanic. Regular=

Shiny= PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou PS Furfrou

Aegislash
Aegislash has two different forms.

Pumpkaboo and Gourgeist
Pumpkaboo and Gourgeist have four different forms, each form having different stats.

Regular=

Shiny= PS Pumpkaboo (n) PS Pumpkaboo (n) PS Pumpkaboo (n) PS Pumpkaboo (n) PS Gourgeist (n) PS Gourgeist (n) PS Gourgeist (n) PS Gourgeist (n)

Xerneas
Xerneas has two different forms namely Neutral and Active modes. While in bag, it stays at Neutral mode. When battling, it changes to active mode. Regular=

Shiny= PS Xerneas PS Xerneas

Zygarde
Zygarde has three different forms.

Hoopa
Hoopa has two different forms. They can be interchanged via Stardust and Hoopa Candy. Regular=

Shiny= PS Hoopa PS Hoopa

Trivia

 * On May, 2018, Alolan forms of Pokémon, originally discovered in the Kanto region, were stated to begin to appear in-game.
 * Some Event Pokémon also count as different forms rather than costumed Pokémon in game, thus they count towards the Special Trades if one of Trainers don't have such Event Pokémon.
 * Shadow Pokémon and Purified Pokémon are also treated as different forms in game.