I'm going to have to agree with Halcyon here; I'm unsure about Kyurem-B being S-Rank. No doubt it has fantastic power and bulk, but it's severely crippled by its Ice typing, leaving it vulnerable to Stealth Rocks and common priority attacks. Obviously any pokemon will lose to their counters, ciaranroy. But the problem is that Kyurem-B is hampered by extremely common threats such as Scizor, which really prevents it from being completely and utterly devastating. Also, I have to question the idea that its ability to 6-0 teams is unparalleled. It doesn't have any way of boosting its power outside of Hone Claws, and no way of boosting its speed bar Choice Scarf. Even though its Substitute set is very effective, its not really fit for sweeping. Even with the protection of a Sub, you'll be hard pressed to flat out 6-0 teams, since most teams carry multiple pokemon faster than Kyurem-B that can break its Substitute and proceed to knock it out. No doubt its a great wallbreaker, but a sweeper of unparalleled power? Probably not. I just don't think its quite cut out for S-Rank.