Shaymin

Shaymin is a Grass-type Mythical Pokémon.

While it is not known to evolve into or from another Pokémon, Shaymin has a second Forme activated by using a Gracidea flower in the daytime. Its original Forme, Land Forme, will then become the Grass/Flying-type Sky Forme. Shaymin's Sky Forme will revert into and remain in its Land Forme during the night or when frozen. Other circumstances may also cause it to revert.

Biology
Shaymin is a small, white hedgehog-like Pokémon. In Land Forme, it has green grass-like fur on its back and a pink flower with two leaves on each side of its head, which resembles the Gracidea flower. Several Gracidea-like flowers also appear on its back whenever it feels comfortable, but when it senses an impending danger, it rapidly hides it back. Its legs are short and its underside is plump. Shaymin is the smallest Mythical Pokémon to date, and one of the shortest Grass-type Pokémon.

In Sky Forme, it has a slender, canine appearance like that of a small reindeer. The fur on its back becomes a mohawk, and it has a red flower petal on the left side of its neck, resembling a scarf or cape. It has flat, white ears resembling wings, a small tuft of fur on the front of its neck, and a stumpy tail. Shaymin will change into Sky Forme and back if it touches a Gracidea. It reverts to Land Forme at night or if it is frozen. Shaymin can instantly purify any polluted area of all impurities in the air and transform it into a lush field of flowers. It takes in the polluted air, purifies it inside its body, breaks it down into water and light, and releases the purified substance in a violent, explosive burst. Its power varies based on the type of pollution absorbed. Shaymin can also communicate with telepathy and sense the gratitude of others.