Build a trap at top of griffin mountain. Lure one in and sleep one night. Then tranq it and put a 15x soothingbalm on it. It will be tamed in no time. Workst with high lvl too .

For the trap: u need 36 stone pillar and around 10 or 11 stone roofs. Put 3 pillors on each other and place the roofs above them. Leef one side open so u can lure the griffin into the trap