There are a few eligible options, like Raikou and Shaymin but there are significantly better options with far fewer hoops to jump through. This is a cup where you should chuckle if you see these ...

Pokemon like Sneasler, Inteleon, and Arceus have top speeds ... it can be a solid choice during the main games. Shaymin originally made its bow in Pokemon Diamond & Pearl as a cute little hedgehog ...