Nope, the only one is the shiny Rayquaza Nobunaga battles you with in the final battle.
In Pokémon Conquest, Nobunaga, the primary antagonist, uses a Shiny Rayquaza in a his final battle with the player. It is released after being defeated, but Nobunaga can later re-link with it after all special episodes have been cleared. -Bulbepedia
Hope This Helped :D