Appearance
A red-and-white sphere like a buttonless Poké Ball, with eyes. The Hisuian form copies a wooden Poké Ball, with a hole on top.

#100
Ball Pokémon
Voltorb is a Electric-type Pokémon, No. 100 in the National Pokédex, introduced in Generation 1 (Kanto region).
« An enigmatic Pokémon that happens to bear a resemblance to a Poké Ball. When excited, it discharges the electric current it has stored in its belly, then lets out a great, uproarious laugh. »
A red-and-white sphere like a buttonless Poké Ball, with eyes. The Hisuian form copies a wooden Poké Ball, with a hole on top.
It lives in electric places and explodes at the slightest bump; the Hisuian kind fires all its current through the hole, often laughing. It evolves into Electrode.
Koga kept several in his Gym as traps. Three injured Ash's Kingler so badly it missed the Silver Conference.
Ken Sugimori designed it as a living Poké Ball. Voltorb may come from "volt" and "orb".