Actor moving up and down

Im making a carnival duck shoot game and in the game I have a rock and a groundhog. I want the groundhog to move up and appear on the rock and stay there for a few seconds and then move back down. Does anybody know how to do this?
Comments
Constrain the actor's Y position to SIN of the actor's time * a multiplier. It will move up and down.
Another way is a series of timers and move to behaviors.
Every 6 seconds...
-- move to 200 (Change the speed so it gets there in two second)
-- after 3 seconds move to 100
I'm not sure exactly what will work for your game, but those are two ways to move an actor up and down.