Catbat

Catbat is the fifth boss found in Wario Land 4 who guards the Sapphire Passage. This cat has a bat on its head, is purple, and is able to levitate, explaining its ghostly appearance.

When engaging in battle, Wario must dodge the waves Catbat sends at him and counter it by hopping onto the wave Catbat sends out and hit him back while avoiding all of the spikes Catbat sends out or else it turns Wario into his puffy form. Wario must repeat this enough times so that Catbat's bat on its head disappears and Catbat then shoots red spikes that can actually injure Wario instead of puff him up. After another time of enough hits, Catbat is defeated.