Olrokk is a level 70 wyvern riding trainer located near the wyvern stables at Shadowmoon Village in the contested territory of Shadowmoon Valley.
He provides the training to allow Horde players to ride flying mounts. At level 60, characters can purchase Expert (225) riding skill for 250
, and at level 70, Artisan riding skill (300) for 5000.
See List of Shadowmoon Valley NPCs.