As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Gengar and Chesnaught:
Did you know? On the night of a full moon, if shadows move on their own and laugh, it must be Gengar’s doing. It is said to emerge from darkness to steal the lives of those who become lost in mountains.
Source: The Pokémon Company
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