Is it in water now? Is his tank still running? Is it loaded with algae or does it look good?
Also, do you see any inverts in the tank? Bristle worms, snails, shrimp?
If you answered yes to all of these, I would transport this rock submerged in water if possible and put it right in your tank and you won't need to cycle it. You should be able to skip a cycle if so.