I think that a cockatrice Pokémon would be cool! Maybe a three stage one that evolves from a little fluffy chick with a snake/dragonish looking head, to having two heads like an Amphisbaena, to having three when it evolves the last time, maybe with a name like Cockathrice, or something way less corny, lol.Also, while I'm on the topic of Greek mythology, I think that a griffin, chimera, or a Pegasus or Hippocampus would be neat. Though I suppose Type: Null and Sivally are technically chimeras.
But most of all, a Ghost-type cat. I mean, when you think about it, cats can tie in perfectly with the Ghost typing. They almost seem to materialize right behind you, can be pretty mysterious, have TONS of superstitions and folklore surrounding them, like black cats being bad luck--though this unfortunately makes them a bit unpopular--or having nine lives. And, as many a cat owner will tell you, they can just be plain weird at times, or unnatural. Maybe it can go about a pun on Janus cats, which are twins that partially fuse in the womb, essentially leaving the cat with two faces, and the mythological figure of Janus, or the patron of pathways, duality, and endings. Though, it may be better just to give the ghost cat two heads as Janus cats can look uncanny to some, and may be a bit difficult to animate, but the reference will still work.
Also, I agree that a non dragon pseudo would be nice. Maybe a Fairy type?
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