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A device used to search for life-forms in water. It looks too difficult to use.

Game descriptions

Ruby, Sapphire, Emerald:A device found inside the ABANDONED SHIP.
FireRed, LeafGreen:A device used to search for life-forms in water. It looks too difficult to use.
Sun, Moon, Ultra Sun, Ultra Moon:A device found inside Sea Mauville.
Sword, Shield, B.Diamond, S.Pearl:A device found inside Sea Mauville.
Scarlet, Violet:A device found inside Sea Mauville.