It will be powerful and fast surely. However, the God-Elk from Princess Mononoke will be the most amazing thing ever. Versus Yveltal? Bah. Cool but not nearly as interesting.
Anybody who chooses Pokemon Y instead of X has lost their mind.
i'm really hoping to see EVOs for Mawile, Kangaskhan, Spinda, Sunflora, Magcargo, Corsola, Hariyama, Grumpig, Banette, Luvdisc, Vespiquen, Glalie and ESPECIALLY Delibird, Kecleon, Shedinja and Dunsparce. All cool pokemon but most of them have awful stats and all lower than rhydon's with the exception of Kangaskhan being 5 higher in total. Still, it's unusable right now. So it's plausible for any of them.
A houndoom evo is theoretically plausible we wont know something like that really. I mean....Rhydon has a base stat total of 485 only 15 less than houndoom. That didnt stop them from making an EVO although it's only 50 higher base stat total(Rhyperior)
Where are my dark/psychic, poison/psychic, Fighting/Ground and ghost/steel Pokemon? i dunno about other people but those are the ones i want to see really bad. Oh and fire/grass. It would be the second fire pokemon not weak to water(reshiram) and its only weaknesses would be rock, and the fairly uncommon flying and poison attacks. To top it off all three of those are mostly used as physical attacks, especially rock. If it has Torkoal Defense it would be quite formidable.