As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Cubone:
Did you know? When the memory of its departed mother brings it to tears, its cries echo mournfully within the skull it wears on its head. This Pokémon wears the skull of its deceased mother. Sometimes Cubone’s dreams make it cry, but each tear Cubone sheds makes it stronger.
Source: The Pokémon Company
Source:Pokémon
