Chesnaught works decently well also.From my experience with this gen's UU so far, Poliwrath is still a great hard check to Crawdaunt. He's immune to Crawdaunt's water STAB, resists his dark STAB, and can phaze him out with Circle Throw.
Intimidate Qwilfish cripples Crawdaunt pretty well, too, whittling him down with Thunder Wave and Poison Jab. Does anyone have any experience using Tangrowth to counter/check Crawdaunt?