>Trainers can Surf directly south to reach a Revive, to the southwest then to the north to reach a man who hands out the BlackGlasses, or to the southwest to make landfall near TM13 (Snore). West of TM13, the path from the BlackGlasses man merges with the TM13 path as it turns south and enters the southern portion of Dark Cave.
Source: Bulbapedia/ Dark Cave
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He is just someone who gives you the item, Blackglasses
