Valkhenhayn is not a difficult matchup, really.
If he goes wolf form at you, just 5/2A out of it. His human form blockstrings aren't really amazing, so it should be pretty easy to block. His 6C is really slow, parry or 5A whenever you see it coming. Asteroid Vision B/C with Barrier Cancel should be enough for you to get in, you can also use 3C as long as you don't get predictable. I don't quite remember, but j.B may be able to beat his j.C, I don't know.
If he uses his multihit DD on you, be aware that you can just mash 4 while blocking it to IB everything, getting a LOT of meter.
BBS also works as a punisher for Wolf Form.