Joltik is one of the shortest Pokémon in existence. In fact, it is too small to generate its own electricity, so it attaches itself to larger Pokémon and feeds off their static electricity. More than often it prefers sticking on Yamper's hindquarters. It will also make its way into houses and feed off electricity in electrical sockets. All of the energy it absorbs it stores in an electric pouch on its body. As seen in the anime, Joltik is not especially aggressive, but will defend itself if bothered. It has been demonstrated that if Joltik is unable to find a source of energy, it will be unable to move and in serious danger.