The Dark Cave is first introduced in PTD2 and the first cave in PTD2 to appear.
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It is a cave at the Northeast part of Route 31. The layout is black, except for the area near the entrance/exit of the cave, initially. Later in the game lights get installed within the cave (possibly as the result of your progress in the past) & you can surf to reach areas in both the past & present incarnations of the cave, however most of the cave is currently unreachable in the past because lights are still being installed in later rooms. Guards block the lower entrance to Route 45 in the present version until you have 8 badges.