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Crab Rider Grmlrml is at 45.3, 12.6 in Highmountain Shipwreck Cove. It's in the north part of Highmountain zone, he's patrolling the murloc village.
He's a part of Adventurer of Highmountain achievement, has a chance to drop Faded Swashbuckler's Jerkin, Valiant's Glory.

For TomTom users:
/way Highmountain 45.3, 12.6 Crab Rider Grmlrml

For the achievement Adventurer of Highmountain you also must kill Crab Rider Grmlrml.
Coordinates: 45.3, 12.6 - Highmountain, Shipwreck Cove
Flight point: Shipwreck Cove - Steven Nelson
Item: Faded Swashbuckler's Jerkin

from the Shipwreck Cove goes to the east, on a small hill you will see Crab Rider Grmlrml

If you're finding it hard to kill him try doing it when you are transformed during Murlocs: The Next Generation and it becomes very easy.

Crab Rider Grmlrml

See if you've already completed this by typing:

/run print(C_QuestLog.IsQuestFlaggedCompleted(39994))