Electrode

Electrode (Japanese: マルマイン Marumain) is an -type Pokémon introduced in Generation I.

Physiology
Electrode is a spherical Pokémon that bears a resemblance to an upside-down Poké Ball. Its top half is white, and its bottom half is red. Electrode has two small beady black eyes, large prominent eyebrows, and a wide mischievously grinning mouth.

Behavior
Electrode is an unpredictable and volatile Pokémon that will explode with little or no stimuli or provocation. It stores much electricity inside its spherical body, and often drifts on winds, full to bursting with stored electricity. It is feared by many due to its explosive and unpredictable nature.

As shown in the fourth episode of Pokémon Generations, Electrode is capable of levitating.

Evolution
Electrode is the evolved form of Voltorb, as of level 30.

Trivia

 * In HeartGold and SoulSilver, if the player character has Electrode traveling alongside them, if they talk to it inside the Rocket Hideout one may receive a message say "Electrode is trembling", indicating it is either scared or agitated being there due to Team Rocket's using Electrode to power their machine.
 * In Super Smash Bros. Brawl, Electrode is an assistant Pokémon, blowing up and causing massive damage; however it does damage to both you and your opponent.
 * It highly resembles its pre-evolution, Voltorb, but it is much larger, at 23.5 inches in diameter and about 54362 cubic inches in volume.
 * Voltorb is only 10 inches in diameter and 4189 cubic inches in volume.
 * Therefore, Electrode is 2.33 times longer in terms of height and 13 times larger in terms of volume.

Origin
Although Electrode resembles an upside-down Poké Ball, it is based on a bomb or landmine. It might also draw inspiration from the phenomenon of ball lightning, as it is known to drift through the atmosphere and explode when it is full of electricity.

Etymology
Electrode's name appears to come from the actual word "electrode", which is a conductor through which electricity enters or leaves. It is also be a combination of "electric" and "explode".