"Just wanna let you guys know that a good core doesn't have to be all about type effectiveness. Also, "w + v beats y for x" so therefore they're good together reasoning is not good for decent team building. Now onto this wonderful anti-meta core. Kyurem-B and Serperior are on opposite ends of the spectrum as far as coverage and defenses but they do have one important thing in common. Both mon's aren't adequately prepared for; add that to their offensive power + potential for destruction and you've got two metagame monsters. When used together they're able to easily dismantle any type of team; offensive, stall , balance, semi-stall, it doesn't matter. The only problems these two have is common priority and Chansey along with a few bulky Steel types. But that's why you have 4 other team slots. I've used this core with two megas so far, Charizard X and Blastoise. Charizard X was used on an offensive team and Mega Blastoise was used on a balanced team. Charizard X is another mon that's unprepared for right now due to players undervaluing its usage as well as them just slapping together generic mon's ( Lando-I, Keldeo, Tyranitar, Scizor, Helmet Garchomp, -insert top 10 usage mega-). Kyurem-B and Serperior are great at luring Chansey and those Steel types that Charizard X has no problem dismantling. Rapid Spin support is definitely needed if you're going to use CharX. Blastoise just does a great job of absorbing hits and it's an extremely effective Spinner because it beats common hazard removers as well as common hazard setters. Hazard control is important for this core to perform well. Also note that you can bend the movesets to your liking depending on what type of team you want to build. For instance, Kyurem-B and Serperior struggle with Scizor, therefore you could use a defensive Will-O-Wisp CharX set or a bulky Blastoise set with a Wish passer. Or you could lure Scizor / Breloom / Ferrothorn with Serperior and use Hidden Power [Fire]. There are a lot of viable options to take advantage of. "