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TODSAY /x/ here what if ghost pokemon didn't evolve from stones but instead if you find them in graveyards/hauntedwoods
like if yhou evolve your evee in the graveyard it becomes ghost
but if you evolve into hauntedwoods spookytree becomes ghost?
Then you can trade it to your friend from the pokemon center but the one thats in ghost town like lavender town, so the mystery deepens this would also explain the ghost girl.
I think that would make ghost type more believable and give it more story to the games.