I doubt they're ghost of other Pokemon. Ghost Pokemon have names and traits and all other sorts of things. Like one person said, they breed and make other ghost types so logically they're just referred to as ghost because they resemble them.
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Like in FRLG the Ghost Marowak,
What happens when a ghost Pokemon dies? Does it become a different ghost Pokemon, or come back as the same ghost Pokemon? Or can a ghost Pokemon EVEN die?
(I like making people think about things that are impossible to completely answer.)
So... to those who said Ghost Poke's are, in one form or another, spirits of the deceased, do PEOPLE die and become Ghost Poke's as well? :uhoh: