Cherrim


 * While Cherrim's forms are called Overcast Form and Sunshine Form in English, the Japanese names of its forms use 「フォルム」 form, which is otherwise only used in the names of forms which are localized as Forme.
 * Cherrim and Castform are the only Pokémon whose alternate forms cannot be viewed in the Pokédex in Diamond, Pearl, and Platinum. Only the Overcast Form and its gender differences (though it has none) are available, but it is not labeled as such.
 * In Generation IV only, Cherrim was the only Pokémon that could change between its forms during battle without the need of a move or ability.
 * The presence of intense sunlight can be brought on with Sunny Day and Drought, but Cherrim did not need to use these itself or be present during the activation of sunlight to change form.
 * This trait was lost in Generation V, due to its form transformations now directly caused by its ability, Flower Gift.

Origin
Cherrim's reaction to light is apparently based on photonastic flowers. Cherrim Sunshine Form seems to be based on cherry blossoms, flowers that are particularly symbolic of Japan.

Its Overcast Form resembles the bud of a fuchsia flower and other flowering plants such as the cherry blossoms and cherry fruits, that tend to grow a form of clustered flowers that hangs on its tree and later blossoms into multiple fruits.

Name origin
Cherrim is a combination of cherry and cherubim or blossom. It may also involve cherimoya (a fruit-bearing tree) or tirim (Irish for dry, as in dry weather).