Kyurem @ Heavy-Duty Boots
EVs: 56 HP / 92 Atk / 232 SpD / 128 Spe
- Dragon Dance
- Icicle Spear
Here's my favorite spread for SubDD Kyurem. 56 HP is for the 101HP Substitute, and in conjunction with 232 SpD, it brings uninvested Clef's Moonblast down to a 3HKO which makes Pressure stalling it much easier (56/232 is something from an old spread Jordy made). 128 Spe w/ Jolly gives you the jump on Zera after one DD, and the remainder is put into Atk to improve rolls with Icicle Spear.
SubDD Kyu is still very niche and you'd only want to use this set on semi-stall or some other team with a way to weaken/remove Steel-types, but on those teams it can PP stall a certain check then sweep.