Aqua Waterfall

Another obstacle, another choice. You can go through the cavern underneath the waterfall, getting a little wet on the way in since the water will fall on you (but only lightly), and battle water pokemon until you get out, or climb the rocks on either side of the waterfall. The rocks are similar to those of Magma Volcano, and lead up to the top of the waterfall, far to high to see from the ground. As you might guess, more disappearances like those of the volcano have happened here, only the monster seems like a wailord, only more elegant and more terrifying.