The Mysterious IslandFollowing the Squirtle trail to the coast, the team comes to a rocky beach, where a large rowboat leans bottom-side-up against a boulder near the water. This appears to be the origin of the Squirtles' exodus from the water; the beach covered with many sorts of tracks.
Offshore, about a mile or two out, everyone can see a small island. It rises a hundred or so feet above the waves, being five or more times in width, and is covered with large haggard-looking trees. Three monolithic heads of carved black stone stand on a ridge above a gray volcanic beach, facing the mainland. Though humanoid, they look menacing and strange, with distinctly fish-like qualities. Beyond them, jutting above the trees at the very peak of the island, is an ominous stone tower wreathed in what appears to be a cloud of dark smoke. Every now and then, an orange-ish glow can be seen radiating through the smoke.
As Brock looks on, he thinks he may have heard a legend about an island like this - called 'Gengar’s Tower' - a mysterious tower on a disappearing island. It is said the appearance of Gengar’s Tower is a bad omen. No one visits Gengar’s Tower when it appears, because they fear the island will disappear with them on it.
The island also seems familiar to Pikachu as well, but more of like being somewhere Pikachu has been to before, rather than something he's actually heard about. Almost like he must have dreamed about it at some point and then forgotten, until just now.
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As everyone considers what to do next, a dark shadow moves, ever-so-slightly, from under the overturned rowboat on the rocky beach...