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Shaymin is a type of Pokemon. The land forme is a forme he can switch to.
The population of Forme is 121.
No, Regigigas does not have a Sky Forme in Pokémon. The only Pokémon that has a Sky Forme is Shaymin which also has the additional Land Forme.
forme (fem.)
(avoir) la forme (to have) la forme to feel good, physically but also mentally to be in good shape la forme? means ca va? how are you?