Castform

Ruby: CASTFORM’s appearance changes with the weather. This POKéMON gained the ability to use the vast power of nature to protect its tiny body.

Sapphire: 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.

Emerald: It alters its form depending on the weather. Changes in the climate such as the temperature and humidity appear to affect its cellular structure.

FireRed +2: It has the ability to change its form into the sun, the rain, or a snow cloud, depending on the weather.

Diamond +4: Its appearance changes with the weather. Recently, its molecules were found to be just like water.

HeartGold +2: This Pokémon can change its cells, taking different forms based on the temperature and humidity.

Black 2 / White 2: Temperature and weather affect its cellular structure, so this Pokémon changes form according to the weather.

Omega Ruby: Castform’s appearance changes with the weather. This Pokémon gained the ability to use the vast power of nature to protect its tiny body.

Alpha Sapphire: Castform borrows the power of nature to transform itself into the guises of the sun, rain, and snow-clouds. This Pokémon’s feelings change with the weather.

Sun: It changes its form depending on the weather. Changes in the temperature or humidity appear to affect its cellular structure.

Moon: Its form changes on its own, due to its cells’ sensitive reactions to temperature and humidity.

Ultra Sun: Although its form changes with the weather, that is apparently the result of a chemical reaction and not the result of its own free will.

Ultra Moon: Its form changes depending on the weather. The rougher conditions get, the rougher Castform’s disposition!