Captain Fishook

Captain Fishook is the thirteenth boss encountered in Luigi's Mansion 3, who haunts The Spectral Catch and guards both the thirteenth floor elevator button and the Yellow Toad's portrait.

Appearance
Captain Fishook is a ghostly Great White shark wearing an eyepatch (which conceals the thirteenth floor elevator button), having a golden earring on his dorsal fin, and having his right fin replaced with a hook-like scythe.

Captain Fishook appears shortly after embarking on his ship, where he swims up. He then reveals the thirteenth floor elevator button underneath his eyepatch before possessing the ship's deck.

Battle
Similar to Facade from the Zelda series, Fishook will start by possessing the deck of his ship, attempting to suck in Luigi from below. To force Fishook out of the deck, Luigi must push three powderkeg bombs thrown by Gold Goobs through his gullet in succession.

Afterwards, Luigi needs to evade Fishhook's scythe and lunging attacks, and specifically time his Strobulb flash so that it affects Fishook's right eye (as his left eye has an eye patch), giving Luigi the chance to attack.

Upon draining his HP to 100, Fishook will change tactics and possess his ship's stern, attempting to overturn the ship ninety degrees backwards; Luigi must use the Suction Shot on a strut with a bullseye icon near the ship's bow to avoid the attack. The rest of Fishook's attack strategy remains otherwise unchanged, though he will continue to possess the stern instead. Upon defeating him, he will struggle to flee only to be forced in downward. Luigi will then obtain the thirteenth elevator button as well as release the yellow Toad atop the ship's stern.