Sablelock has great disruption power, often barring your opponent's setup. But when it comes right down to it, Sablelock has very little raw attacking power. So, if you can get something with decent HP and damage set up, and get it set up fast, chances are Sablelock will have to resort to sniping things on the bench because it doesn't have the attack power to take on the active. Eventually, they will fall behind in the prize trade, and the non-Sablelock player will take a lead and possibly win the game. Against one Sablelock deck, I set up two Jumpluffs with a full bench and KOd multiple Pokemon. He fell behind, and after he managed to kill one Jumpluff, I had topdecked into the stuff I needed for another Jumpluff. He scooped with me having two prizes left and him having three because his bench was so bad.
So overall, any deck can beat Sablelock, as long as it gets set up to do 110 damage over the course of two turns.