And I dont mean the HM, I mean like how all the other Legendary Dragons just fly about Carrying Castles, having Battles, the use.
Thank You.
Kyurem has two arms, each with its own claw and each arm is jointed together from its blue oddly shaped wings, believed to be used for flying as well as storing cold air. Each of its wings are oddly proportioned and have two spikes of ice each. [Source][1]
So yes, he is capable of flying. [1]: http://bulbapedia.bulbagarden.net/wiki/Kyurem_(Pokémon)