@Phoenix:
At first there was 20. But it's actually only 19. The Neferteri family pulled out for some reason. Then the 19 other nations abandoned their kingdoms by moving to Mariejoa and became known as Celestial Dragons.
Her family doesn't have the power that the Celestial Dragons do. At most, all they have now is a vote at the Reverie. It'll end up being alot more to the reason why they pulled out. Like they didn't like what went down to the ancient kingdom so they pulled out and help build the Polyglyphs in secret.
I guess that would explain why Pluton is in Alabasta (something Robin confirmed). But how would Crocodile have heard of it? I doubt a pirate like him, no matter how strong he is, have the resources or connections to learn of such a thing.
Regardless, how did the Ancient Kingdom lose the war against the alliance if they built the Ancient Weapons themselves (and probably the Vivre cards as well)?