CASTFORM’s appearance changes with the weather. This POKéMON gained the ability to use the vast power of nature to protect its tiny body. CASTFORM borrows the power of nature to transform itself into the guises of the sun, rain clouds, and snow clouds. This POKéMON’s feelings change with the weather. It alters its form depending on the weather. Changes in the climate such as the temperature and humidity appear to affect its cellular structure. It has the ability to change its form into the sun, the rain, or a snow cloud, depending on the weather.