Catbat

From the Super Mario Wiki

Catbat is the fifth boss in the Game Boy Advance video game Wario Land 4 and also the guardian of the Sapphire Passage. Catbat resembles a large purple cat with no legs and a bat sticking out of its head. Since this monster has the features and wings of a bat, Catbat can fly in the air.

Catbat's battle area has a pool of water in the floor. In order to defeat the monster, Wario must ride on the waves Catbat creates when it crashes into the pool; all the while Wario must avoid the spiked objects that Catbat spits out. Should Wario touch one, he will become Puffy Wario and float up costing precious time. When Catbat is low on health, the bat head disappears and the spiked objects become red. This time, they will hurt Wario (instead of transforming him). When on the newly undulating wave, Wario must jump off and stomp Catbat's head. After enough hits, Catbat is defeated and Wario is rewarded with the creature's bracelets.

Wario Land 4 Bosses
Spoiled Rotten | Cractus | Cuckoo Condor | Aerodent | Catbat | Golden Diva

Wario Series Characters
9-Volt | 18-Volt | Ashley and Red | Dr. Crygor | Dr. Payne | Dribble and Spitz | Goodstyle | Jimmy P. | Jimmy T. | Kat and Ana | Ken the Reporter | Mike | Mona | Orbulon | Penny Crygor | Princess Shokora | Queen Merelda | Sewer Guru | Thang Family | Wanda | Wario | Young Cricket and Master Mantis
Major Villains
Captain Syrup and the Black Sugar Pirates| Denpuu | Awazon Genie | Rudy the Clown | Golden Diva | Black Jewel | Count Cannoli | Terrormisu | Shake King
Minor Villains
Aerodent | Ball Bunny | Brawl Doll | Captain Skull | Carpaccio | Catbat | Clown-a-Round | Cractus | Cuckoo Condor | Dinomighty | Dual Dragon | Greenfist | Ironsider | Mad Scienstein | Mean Emcee | Red-Brief J | SandWorm | Spideraticus | Spoiled Rotten | Winter Windster