Does a Cubone kill its own mother? It's pretty common knowledge that Cubone wields the skull of it's deceased mother. But how does the mother die? Do Cubone's kill their mother at birth, or do they just die after giving birth?
Can't say for sure but, if Cubones do kill their mothers at birth, I would think it is not intentional—at least from the sad tone of its Pokédex entries.


Always wears the skull of its deceased mother on its head and never shows its face. It cries mournfully in the moonlight.

It pines for the mother it will never see again. Seeing a likeness of its mother in the full moon, it cries.

When it thinks of its dead mother, it cries.


Source: Bulbapedia - Cubone

This particular entry seems to have the most detail about the mother's death, but I don't think it is very clear (Generation I):

It lost its mother after its birth. It wears its mother's skull, never revealing its true face.