I'm surprised it took them this long, that move pool is scary big, as well as the stats needed to support it, and 1 weakness, which can be mostly corrected in the rain

On the Black Kyurem note; it actually has a pretty damn respectable movepool

Outrage
Fusion Bolt
Freeze Shock
Stone Edge
Rock Slide
Dragon Tail
Return
Iron Head
Zen Headbutt
Shadow Claw

The only issue I see is only 4 of those have 100% accuracy
(Should also mention this is only the physical move pool, with 120 special attack, that is also viable in OU)