Well ive seen this deck played i havent played this deck. He would of been hard pressed to use sableye's attack more than once.....but i am planning to make this deck just need two more darkris.
You have only seen a couple games with this deck and you weren't even playing with it so you can't give advice on it unless you experience it yourself. Sableye is used to get back max potions and catchers when you run out and you would use it as a starting pokemon to get back all of the items you used on your first turn to potentially get that turn 2 Hydreigon.