White Kyurem has been uber since its inception, and the only thing keeping Black Kyurem down was its lacking movepool. Kyu-B now has an arguably *better* movepool than Kyu-W with strong physical BoltBeam coverage and Dragon Dance, still has that 700 BST, and Max Moves are even better than Z-moves for making Freeze Shock viable.I’ve heard people say that Kyurem-B is gonna break the meta but its too early to tell. Remember when people thought Zard X would break the meta back in X and Y? But no thought this thing got a huge buff in both DD and physical ice stab.
This thing is now FAR better than Mega Charizard X ever was, given that it has 40 more points in base attack, good coverage, and still gets free choice of an item. It's more comparable to Mega Salamence, really.