List of Pokémon with different forms

Some Pokémon may appear in different forms during certain weather conditions or in certain regions. These Pokémon have some differences comparing them to regular ones of the species, such as different types, moves, base stats and height and weight.

Alolan forms
There are certain Kanto-region Pokémon that have different forms as they inhabit Alola region.

Unown
In case of Unown, there are no different types, moves nor statistics among any of its forms. Each of these forms resembles other letter of Latin alphabet with addition of exclamation and question marks.

Spinda
As revealed through datamining, Spinda in Pokémon GO may have 8 different forms.

Castform
Castform can appear in different forms when spawns during certain weather conditions.

Trivia

 * On May, 2018, Alolan forms of Pokémon, originally discovered in the Kanto region, were stated to begin to appear in-game.