Originally Posted by Fat BlackLight
I second this. If Kyurem-B had a faster Speed tier, we would see no problems like this. However, at 95 Kyurem-B gets outrun by a ton of threats, which forces it to switch out, which forces entry hazard damage, which Kyurem is weak to.... Don't get me wrong, its good, but it isn't A-Rank, its Speed and typing make sure of that.
Support. Insane power doesn't mean much when you has a terrible typing (defensively, and offensively Dragon/Ice is redundant), middling speed and shallow movepool. STAB Outrage from a 170 base attack is so appealing... but when you see Kyurem-B's drawbacks, you actually start to get away from it in lieu of other, less powerful but faster Dragons that have better typing. So, it's a B-Tier pokémon easily. Kyurem-B's potential lies on wall/stallbreaking, but defensive teams aren't so common to justify this usage, and even then Kyurem-B faces competition as a stallbreaker with a lot of things, such as mixed Salamence, Mew and SubCM Jirachi. Kyurem-B may be a good choice if you still have problems with stall/defensive teams, but as Pocket said it's not going to sweep anytime soon.