Maybe seconding this? Hydreigon is definitely an underrated threat and he hurts everything like hell. I wouldn't call him the best scarfer, however. His odd speed hurts him, making him weak to faster revenge killers who have a type advantage over him (Salamence, the Lati twins, Terrakion and Keldeo being the major threats), and I personally feel that not allowing Hydreigon to switch moves is a waste of his fantastic coverage. Is he A-tier material, though? Eh, maybe. I wouldn't complain if he was moved, that's for sure.