@Wrave and Tyranitarphantom: Sorry, I didn't know about Ponyta. Instead, take a Magmar named Flamer. It must burn 50 Pokémon without Will-o-wisp before it can be used in the Elite Four.
@Wrave: For Diamond, take 4movsyndrm the Chimchar. It must have one status move and three attacking moves that cannot be of the same category (i.e. cannot be 3 special or 3 physical) to evolve into Infernape and must keep this moveset.