Bubble Cave

Bubble Cave is the eighth "wild" area of the game.

It is a dark and damp cave, presumably underwater, and is home to the Water Crystal. Bats, snakes, an alligator, and even a komodo dragon are stationed here. Bubble Cave is thin and winding, with various offshoots and dead ends. It is often considered one of the more dangerous areas in the game due to the high amount of enemies and thin corridors. In the most central room sits the alligator, the only one to be found on land in the game, and at the end of the main tunnel is located the Water Crystal and its shrine. There is a hidden room accessible only by Calling a dolphin and having it ferry you across a stream in exchange for a Red Sea Bream, as well as a level four rock that typically hides the Yuke Butterfly in a smaller room behind it.

Find the Water Crystal
Using Whiskers/Sniffing Radar, locate the Water Crystal at the end of Bubble Cave.