By covering him. Even when on the PK, you can still know where people are and be covering them within actually right on top of them. Just to many times they let him go unchecked, and he sneaks in. Like the last goal he scored, sure he has a good shot and Gonchar was on him, but if you saw the play unfold, another player (not sure who) went to get the puck when there was already a guy there, thus leaving Ovey wide open.
They should know Ovey is a weapon and he takes a lot of shots. You shut him down, you have a good chance at winning games. Just as I said, to many times they let Ovey skate around without anyone being in arms reach of him. And a player like that, you need to be on him.
Or they could call up one of the Sharks defencemen and ask them. They have a lot of free time lately.