system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] how does cubone's story work?

so cubone wears its dead mother's skull on its head...yeah sure.

but....EVERY cubone? does every cubone have a dead mom? they have the same motivation of "I must wear my mother's skull"?
gpt
The Pokedex is often inaccurate, and this is clearly one of those times. The skull Cubone wears is not the skull of its dead mother, it is merely a natural part of their biology. 

It's easily provable. Get a female Marowak, drop it off at a daycare along with a compatible male. Sooner or later, you'll get an egg, which will hatch into a Cubone, complete with skull helmet. Meanwhile, the Cubone's mother (your Marowak) is alive and well, still in the daycare.