Dragonite vs Sazandra
Well, Hydreigon's already been pit against all the other pseudo legendaries, so might as well complete the set.
Dragonite's the original pseudo and the original Dragon. Hydreigon is the latest pesudo and so far, the only one who prefers special attacks over physical ones.
Dragonite gets the same ability as Lugia thanks to Dream World, which means she takes less damage the more Hp she has. Add Roos (she doesn't need a TM for it) and you've got yourself a very durable Pokemon. On the other hand, Hydreigon has two immunities and no 4x weakness.
Who'd win in a fight?
Who's more useful?
Who do you like best?
Dragonite's my choice, mostly because she and her family are one of my top five favorite all time Pokemon. Plus, she's the original, so yeah. Also, I haven't used Hydreigon yet, so I am a little biased currently. Still love the hydra's design though.