Pokémon Forms
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"Pokémon forms" is typically used to refer to gendered forms, although some Pokémon (such as Castform) may have alternate forms they can switch between in dungeons.
Gender Forms
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There are four possible gender settings: Male, Female, Genderless, and Invalid.
In vanilla Explorers of Sky, if a Pokémon only appears as one gender form, its first gender form will be listed as the desired single gender (Male, Female, or Genderless), and its second gender form will be listed as Invalid.
Special Pokémon Forms
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Certain Pokémon have specific forms they switch between depending on certain conditions. Other Pokémon have more forms than just the two gender slots.
Pokémon that change form in dungeons are hardcoded to have all of their forms' sprites loaded at once, which makes their sprite size and body size surprisingly large.
Unown
Unown is a special case in this list because it has some hardcoded behavior relating to its name.
Castform
Deoxys
Cherrim
Giratina
Giratina changes from Altered Form to Origin Form in Explorers of Sky-exclusive dungeons.
Shaymin
Shaymin changes from Land Form to Sky Form upon using a Gracidea. It is hardcoded to have double movement speed in Sky Form.
Note that the Gracidea item does not work until you clear Sky Peak.