Grocklar is a rare elite giant that can be found in Grizzly Hills. He can most commonly be found walking west of Granite Springs. He is the only huge ass rock giant in the zone, so if he is up he is pretty much impossible to miss. Since he is so big and unique you won't even need to use a macro to find him.
As with the other elites, Grocklar has roughly a 3 - 6 hour spawn timer. However, you check each of his spawn locations every 10 - 15 minutes, just incase he pops up. If you're interested in finding some farming locations while you wait, check out my farming locations page by clicking here.
Grocklar Spawn Locations and Video