7 Crazy Pokemon Origin Theories That'll Blow Your Mind
6. Gengar Is A Dead Clefable
What with all the animal based creatures in the world, Ghost Pokémon stand out as one of the weirder elements of the universe. Just where do they come from; is there a non-ghost version of Gastly, Haunter and Gengar? Well, yes, it transpires.
Fairies are another strange element of the world and could in fact be the bridge between the world of Kanto and the other side. You see, Gengar is actually the ghost of Clefable.
On a simple physical level they share a lot (pointy ears, stubby limbs, three fingers, tail, wings/spikes on their back), but there's more to it than that; both characters tend to be seen on a full moon. While that's a pretty ghostly thing anyway, could Gengar do it to honour their previous life. You can extend this to suggest that Haunter is Clefable and Generation II's Cleffa is Gastly; although there's less cosmetic similarities, it's not a huge leap.
Another, similar theory is that Gastly is a dead Cloyster without its shell. Althoughhile they do indeed look alike, there's not enough in-world logic to back it up as the Gengar-Clefable link.