Genie

Genie is the Nightmare of Bottle Grotto, the second dungeon in The Legend of Zelda: Link's Awakening. Genie has a clown-like appearance, and uses its bottle to protect itself from Link's attacks.

Strategy
After it pops out of its bottle and throws a series of fireballs at Link, it goes back into the bottle. When it starts chasing you, you can strike the bottle to stun it, and then use the Power Bracelet to lift it and throw it into a wall. After this is done three times, the bottle is broken, and Genie goes into a frenzy.

Now, it can be damaged with the sword. After each hit, Genie will split into two and reform. While he is split into two, it cannot be damaged. The minute it reforms, strike it again. After repeating this a number of times, Genie will be defeated, and you can retrieve the Conch Horn.