Well, it kinda depends. Though it's lack of speed and mediocre HP, Def and SpD kind of kills it, I see some potential on it.
Clawitzier it's a bit close to something similar to a "tank": meant to be slow, but able to deal large damage if it can endure the damage it recieves. Investing IVs on its defenses or health may keep him alive for a while in a match.
Maybe using it with trick room can help, since it's base speed at max level it's 59. I may recomend using moves that take full advantage of its ability, Mega Launcher (which boosts up all pulse and aura moves. This includes moves like Heal Pulse, Aura Sphere, Dark Pulse and Water Pulse); U-Turn's another move you may want to have for him if you need to switch it out while dealing some damage to the foe.
So... yeah, it's decent in my opinion. It's not fast, sure, but it gets part of the job done sometimes. Although not the best water-type to choose, it can do some little or good damage to a foe's defense (experiment with it and see what you can do!)
