I read Special until just after the Yellow arc, so I've yet to discover Gold's adventures. Though I'm drawing most of my inspiration directly from the games, I'm also taking from Special, Electric Tale, and the TCG.
Well you might like to know I've already completed the mythos. Main figures are Mew, Mewtwo, Lugia, ho-Oh, and the first two trios. Several other Legendaries also feature, but I don't want to ruin too much.
I established a slight creation story, taking from Christianity, Greek mythology, and Egyptian mythology.