Master Eddy

Master Eddy is a boss in Chapter 7 of Mother 3. He is fought at the far end of the Sea Floor Dungeon, which leads towards Tanetane Island. Right before he would be fully defeated, Master Eddy generates a massive whirlpool which causes all of Lucas and company's items to float away, reduces their HP to 1 and their PP to 0, and washes them up helpless on the shore of Tanetane.

Battle Memory description
"This bizarre creature is like a guardian deity of the sea. He punishes violators with powerful whirlpools."