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A significant portion of dev time probably went to this.
The now-surfable lake has 3 major dive spots, all of which are actually pretty hard to access because their entrances are hidden and literally one tile-wide. You can find goddies there, including a megastone, but what seems to be important is an egagement ring. You exchange stuff with people around the city until at the end you give a Klefki guy we met earlier at the evil cult temple his house key, and he gives you his Klefki. His Klefki couldh't find his house key, but it found something else.
