A baby Kangaskhan, who's mother died will use the skull of its dead mother and become a completely different Pokemon and uses one of its mothers marrow bones as a weapon and has to live on its own. It will turn into Cubone. Living in this different lifestyle lets it evolve into a Marowak.
Now you know what Cubone actually is. ;)
This is actually a theory
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Facts and theories about Pokemon you must know
De TodoFacts and theories about Pokemon you must know. I hope you will like, vote,and comment :)