Originally Posted by Fat Pokémon Trainer R
I personally believe that the best Generation V dragon is Kyurem-W, followed closely by Reshiram, due to the former being the greatest anti-lead in the entire tier (with Choice Specs, it is able to effortlessly demolish Dialga, Kyogre, Groudon, Forretress and Tyranitar, which are all extremely common leads), and the sheer, destructive power of the latter's Sun-boosted Blue Flare attack.
Tyranitar anti-lead always wear a focus sash, able to 2HKO everything without the need to lock himself on anything, he
is the best anti-lead in the metagame. You're right about Wkyurem, but Reshiram isnt the second best dragon at all, Zekrom has access to a lot of tools which let him be far more useful than Ram (one of them is his neutral weakness to SR).