The first was a modern time war between two cults of evil and good, the next was the same except for the time setting, which was the future. The last time was set in a WWII like era. Basically, in the world of the main series, it was inhabited by Pokémon with human behavior, with no humans at all. The Delphox's name was Eris, the leader of the evil cults.
Oh, and this was on Serebii.