"Voltorb was first sighted at a company that manufactures Poke Balls. The link between that sighting and the fact that this Pokemon looks very similar to a Poke Ball remains a mystery."
Voltorb is one of those Pokemon that you can't help but go, "yeah, they did that". As the Pokedex notes, it's basically a living Pokeball. Though how this is possible has never been explained by anyone at the Pokemon company. Despite this, Voltorb has been very popular over the years in both the games and the anime.
Voltorb's Basic Attacks are Tackle and Spark. While its Special Attacks are Discharge, Signal Beam, and Thunderbolt