Dark Cave

Dark Cave is a single-level cave located in eastern Johto. It is not necessary to enter the cave to complete the storyline, but it contains some decent loot. In the twenty years between Gold, Silver, HeartGold, and SoulSilver, the cave has been virtually unchanged.

Blackthorn Side
The northernmost point in the cave is at the entrance leading to and from Route 45 just south of Blackthorn City. The path of the cave makes a 90-degree turn to the right before proceeding south for a short distance to the first of two underground ponds in the cave. Trainers can Surf or Swim directly south to reach a bag of Revives (x5), to the southwest then to the north to reach a man who asks for your assistance, or to the southwest to make landfall near ((A USEFUL TM GOES HERE)). West of ((USEFUL TM)), the path from the Pleading Man merges with the TM path as it turns south and meets a dead-end, where a cave-in occurred years earlier.

Violet Side
On the other side of the cave-in, the path comes to the second of two ponds. Trainers can Surf or Swim from this point to snag a Paralyze Heal and reach Route 31, or, if a Pokémon knows Rock Smash, or a Trainer is proficient enough with a heavy blunt weapon (such as an Iron Sledgehammer), they can also travel to the south and dispose of a series of rocks as they head north and find a hidden Elixer and then eastward toward a Hyper Potion. Near the item, the path of the cave turns south, passing a Full Heal and a Dire Hit before reaching its southernmost point at Route 46.