Jigglypuff

, known as the Balloon Pokémon, is shaped like a round ball, with pink skin, large blue or green eyes, catlike ears, and a tuft of fur on its forehead. Its skin is rubbery and stretchy. It can inflate its body like a balloon (usually when it becomes angry; this is accompanied by a distinctive "honk" sound), or flatten its body, much like fellow Nintendo character Kirby. An exact limit to the size it can grow to in this manner is unknown. Jigglypuff are characterized by putting their enemies to sleep by singing a lullaby.  Before beginning to sing, they mesmerize the opponent with their soft, glowing eyes, and if they inflate themselves, they can sing for longer periods of time. They can easily adjust the wavelength of their voices to that of the brain waves of a sleeping being, allowing for their pleasing melody to put its audience to sleep. They sing without pausing to take a breath, so if the opponent is resistant to sleeping, they potentially run out of air. Game Freak's staff have noted Jigglypuff as both one of their and the public's favorite Pokémon, in terms of both anime and video game appearances.