Aerodent

Aerodent is a rodent that appears in the game Wario Land 4 for the Game Boy Advance. He guards the Topaz Passage.

Aerodent hides inside an inflated bear balloon. Initially, this balloon is out of reach to Wario. However, Aerodent will release a Tack Soldier to jab Wario. 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, flipping it upside-down. Aerodent will appear and be vulnerable to attack for a short time.

After Aerodent is hit or a certain amount of time has passed, Aerodent will re-inflate the teddy bear balloon and the process repeats. Eventually, Aerodent will fling fireballs at Wario, which spread into flames upon contact with the ground. If Wario touches the fireball or the flames, he will turn into Flaming Wario, losing all control for some time.