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While it is not known to evolve into or from any other Pokémon, Castform has the ability to change forms depending on the current weather.
During normal weather, fog, a sandstorm, or a shadowy aura, it is in Normal form and is a Normal type.
During harsh sunlight, it is in Sunny Form and is a Fire type.
During rain, it is in Rainy Form and is a Water type.
During hail it is in Snowy Form and is an Ice type.
