Naturally, they sport heavily modified appearances as well. Marvels of modern science, they have different typings than ordinary members of their species, and learn an entirely different set of moves.
A Day in the Limelight: This game predominantly features several of the "Secret Pokémon" as being central to the plot.Both Arceus and Regigigas get Primal Forms.Here, it was stated to all but be Arceus's equal, someone Arceus defeated to become the creator of this world, and even gets a Primal Form with an ability that makes it ALL types at once. In canon, it was "merely" a Legendary dragon and part of the Creation Trio under the domain of its Trio Master Arceus. Giratina, yes, Giratina counts in this game.