Hey guys, I know this isn't really very likely because of Mewtwo (>_>), but wouldn't it be awesome to play as Keldeo? I'd imagine this to be his moveset:
Standard B: Water Gun (works like Squirtle's in Brawl)
Side B: Aqua Jet (could work like a side recovery move too)
Up B: Hydro Pump (Keldeo would fly for a short time with this move like he does in his movie by shooting the water from his hooves)
Down B: Sacred Sword
Final Smash: Secret Sword (Keldeo transforms to Resolute form and kicks ass)
Keldeo's A moves would utilize his hooves and probably a little water. Maybe even his horn too.