IIRC, he first pops up in the Denver boxed set, where he and his sister live there. They have a small rivalry, making runs against one another (non-lethal, natch) and generally don't get along terribly well, but at the end of teh day, blood holds out.
When Ghostwalker arrives, Dzitbalchen bails out (I can't recall if his sister does or not, but I want to say no) since, well, Big Bad Dragon can eat normal dragons with ease. He keeps up his smuggling ring (Both siblings run smuggler rings in Denver), but from the 'launch' side while his sister runs more of the 'arrival' side. He winds up either in the PCC or Aztlan proper (Again, I forget which) and seems to settle in.
I lose track of him at this point, until the bombing incident that, rightly or not, is pinned on him.
Denver has the majority of info, followed by ... hrm. Year of the Comet, I think, for when Ghostwalker arrives.
He wasn't a Great Dragon, nor is his sister.