The core is meant to control hazards with Sableye and Starmie obviously, which allows Kyurem to switch in much more freely to nuke shit (shit being balance teams here). This core handles some pokemon in the metagame, like Keldeo and Heatran with Starmie, Gengar when SR are down with Sableye, etc. Kyurem is 4 attacks to punch as much holes as possible and has max speed to outspeed max jolly Gyarados. But these three don't nearly take on enough at all with pokemon that are so slow. I knew taking on all the fairies (the biggest threats to this core) in one teamslot wasn't gonna be possible, or at least not reliably. So, I went with Skarmory, whose Special Defense investment is pretty high, in order to be able to take two Timid Gardevoir's Focus Blasts with SR down, and most of the time with SR up. It has iron head so that it walling Diancie isn't actually useless, and Counter in order to beat Metagross-Mega and Scizor-Mega. Spikes are obviously great paired with Sableye and with Kyurem, they are even more of an amazing asset to boast. What Skarmory doesn't beat though, is more passive fairies, in particular Clefable. It also opens a huge weakness to Charizard-Y. This is where Talonflame comes in handy, being a counter to Clefable (Unaware doesn't care about your boosts but you do outstall it). Of course, people really like to pressure Talonflame with Stealth Rock but the core of the team makes this strategy much harder to set up. The last slot had to be a counter to electric types, an checking the now uncommon threat that is Charizard-X was necessary as it pretty much ate this build alive. Hippowdon is a mon that sees a lot of usage right now and for good reasons, countering Thundurus, offensive Heatran (non PowerBeam variants) and checking a bunch of physical attackers of course. It provides a much needed check to sand teams, in particular LO Excadrill.