He is the one I blame for RAWR DRAGONS. Like, Salamence is meant to contrast Dragonite, and Hydreigon is meant to be evil or something. But this guy? He's not even a dragon, he has none of the mystical attributes of dragons even Salamence has, he's just a land shark!
It's easily one of my most disliked pokémon.
On the other end, I really like Hydreigon. It's based on the Yamata no Orochi, it's one of the pokemon that are closest to being inherently evil for a change, I love the whole line (blind hydras!) and their design...
Pretty much this. Also, Garchomp's design is awkward while Hydreigon's is badass.