Well, here it goes. This is my first post on one of the POTW's, but I've gotten pretty good at EV training and all, so I thought I'd give it a shot.
Hailstorm Specialty Kyurem
Item: Icy Rock
EVs: 100 Def, 252 SpA, 100 SpD, 56 Spd
Blizzard gains Hail's bonus accuracy; Earth Power covers Steel and Rock-types, Dragon Pulse for STAB; and Ancientpower's stat boost can be very useful.
Other options might be Glaciate for multi-battles, signal beam for typing, and maybe draco meteor? Also, having Icy Rock allows it to keep its Hail boost for pretty much the whole time Kyurem will last if the Hail was recent.
Kingmn2 - Done...
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