Matchup isn't that bad. I say it's even or slightly in Ara's favor. Valk has a tough time getting in once Bell bug is out. Bell + 2D shuts down all horizontal movement, even his stupid wolf form lunge shit. I often combo the 2 if the player is dumb enough to lunge at me in wolf form.
Air to Air is great for you but air to ground is a no-no since his 2C is just way too good.
Also, don't backdash so much against him, Valk blows up back dashes for free.
If you lame him out and block the matchup isn't that difficult.