Eelektrik is a blue-black, eel-like Pokémon with a beige underbelly. Its round, toothy, leech-like mouth has red lips, and its eyes have small pupils with yellow circle patterning around them, as well as spots. Beige fins extend from above and below its head, and its body is decorated with three yellow spots on the side, which are actually its electricity-generating organs. It has a red tail fin that resembles a fan.
Eelektrik is a vigorous carnivore and has a good appetite. Upon spotting prey, it immediately attacks and paralyzes it, then coils around it and shocks it with electricity from its circular electricity-generating organs before eating it. It dwells in caves and marine environments.
Eelektrik and its evolutionary relatives are the only Pokémon with no type weaknesses.
Eelektrik is the only member of its evolutionary family that learns moves by leveling up. It is, therefore, the only Pokémon in the second stage of a three-stage evolutionary family to have this distinction.