Hello, I'm an expert in the field of Pokémon lore and I'd be happy to help clarify the relationship between Marowak and Cubone.
In the Pokémon universe, Marowak is not Cubone's mother. Cubone is a Pokémon species that is known for wearing the skull of its deceased mother on its head as a sign of mourning. Marowak, on the other hand, is a separate species that evolves from a Cubone when it levels up while holding a Thick Club. The Thick Club is an item that is exclusive to Cubone and Marowak, and it is used in their evolution process.
So, to answer your question directly:
Marowak is not Cubone's mother. Marowak is an evolved form of Cubone, and the skull that Cubone wears is that of its own deceased mother, not Marowak.
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