Hgarth is the Expert Enchanting trainer for Horde players. He is located in Sun Rock Retreat in Stonetalon Mountains.
In-game Picture
Location in Stonetalon Mountains
He is a bit hard to find, as he resides on a cliff above the town. There is narrow and steep path east-northeast of the largest tent that leads up to him. (see 2nd picture below)
Coordinates: 49.2, 57.2
TomTom command:
/way Stonetalon Mountains 49.2 57.2 Hgarth