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A swamp monster with a combination of Grass, Water or Ground typings.
Multiple cultures have urban legends and stories relating to monsters that live underwater, and the seemingly harmless typing would be a fresh change in pace in contrast to the multiple Dragons and Dark type pseudolegends.
Water and Grass both have abilities that neutralize attacks from other types too like Sap Sipper and Storm Drain while Ground offers an immunity from Electric types on its own.