Gastly episode... Well, there's two I know of. One where it possesses a maiden and another where Ash dies and his evolutionary forms along with himself play with him. The maiden one makes less sense though so I'll go with that one that I think you're talking about. Between you and me, I haven't played the 4th gen games yet. When the 4th gen Pokemon were released, I hated them so bad that they actually put me off the games because of how unoriginal and fake they looked. They ruined Rhyhorn and its evolution chain with what was it called... Rhyperior? What the... Urgh. I guess I do plan to eventually buy it though and play. As for Arceus, I heard about the whole galaxy god Pokemon thing. It is a bit stupid, Nintendo are obviously stuck for ideas now.