Dedenne

Dedenne is a bipedal, orange, rodent-like Pokémon with a round body. It has round black ears with pale yellow interiors, black eyes, a tiny nose, and a prominent upper incisor with a slight point. On each cheek is a circular, dark orange electric sac with two black whiskers. The upper whiskers have branches and resemble antennae, while the lower whiskers are simple. There is a thick black stripe down its back and it has a pale yellow belly. It has stubby limbs with three digits on each paw and a long, thin black tail with a tuft of fur on the tip.

Dedenne's upper whiskers serve as antennae that can send and receive electrical waves. This allows it to communicate with others of its kind over great distances, sharing locations of food or electricity, and sense its surroundings. The simple, lower whiskers are organs that can fire electricity. However, Dedenne is small and its electricity-generating organ is under-developed, making it unable to generate a lot of electricity on its own. It absorbs electricity from other electric Pokémon, or from homes and buildings by plugging its tail into outlets; Dedenne are known to live near humans due to this behavior. When it is low on charge, it curls up and sleeps. As mentioned in the Sleep Style Dex, Dedenne will occasionally fall asleep while sucking on its tail. It is believed that Dedenne does this due to being happy with all the electricity it absorbed.

(Source: Bulbapedia)