Memes aside, Kyurem-B is easily the best balance breaker in the tier atm, being able to tear apart some of the tier's most common balance cores, such as Bro Fist/ABR's Venu squad, Celepex, Ferrothorn, AV Tangs, fat Landos, etc. Life Orb with Ice Beam / Fusion Bolt / HP Fire / Roost or Earth Power is usualy what it runs, with HP Fire being pretty much mandatory without Zone support to prevent Mega Sciz from coming in freely. Earth Power lets it pressure Heatran squads more without having to predict with Fusion Bolt, while Roost allows it to preserve its health and allow it to abuse its decent defensive typing as well as buffer its hazard weakness a bit. Pair this monster with Tapu Koko for pseudo STAB on Fusion Bolt and VoltTurn support, it's very easy to see why it's so good.