Aerodent

Aerodent is the fourth boss in the Game Boy Advance game Wario Land 4. He guards the Topaz Passage. Aerodent hides inside an inflated bear balloon. Initially, this balloon is out of reach to Wario. However, he will release a Tack Soldier to jab him. If Wario stuns one of these, it will flip upside down so its spike is pointing up. Throwing the enemy back at the patch on the bottom of the boss deflates its teddy bear, allowing Wario to attack it, after Wario bashes its foot, it will flip upside-down. Aerodent will appear and be vulnerable to attack for a short time.

After Aerodent floats up high enough when vulnerable, he will right himself and re-inflate the teddy bear balloon, and the process repeats. It is possible but difficult to hit Aerodent multiple times before he floats upwards. Once Aerodent withstands enough damage, it will launch fireballs at Wario, which spread into flames upon contact with the ground. If he touches the fireball or the flames, he will turn into Flaming Wario, losing all control for some time.

Aerodent starts the battle with 16 health and thus requires 16 hits to defeat. The item Aerodent is most vulnerable to is the Large Lips, which takes away 14 health, leaving it with only 2 health.