Hey, i hope all of you are fine. I totaly agree with 0danobunaga.
The problem is the combination of Freeze dry + Kyurem.
When i see the teams used by players for face the majority of Ou poke you can see a lot of team with a ground poke + one Water + one Dragon/ Fly poke.
Here we have the problem. Freeze Dry work well for all this type of poke and Kyurem have good spd, good bulk and a insane dmg.
Thats make him too dangerous with this moove. Some defensiv pokemon generaly used good for counter this poke like Celesteela, Magearna cant be used in pro for counter him.
So yeah Scizor is one of the best answer true but some Kyurem can too run hp fire and its a gg.
To be honest i think Kyurem-black is too dangerous with this moove.
Kyurem-Black is sometime prefered for the versatility and the capacity to break defensive poke and spécial defensive poke in the same time, ad freeze dry at this poke and you get a monster.
I think its good to remember all the discussion and problem Kyurem-black have caused in other competitiv and tournament like smog tourna.
I wish you at all a good game and ty for the post.