Red: Usually found in power plants. Easily mistaken for a POKé BALL, they have zapped many people.Yellow: It is said to camouflage itself as a POKé BALL. It will self-destruct with very little stimulus.Gold: It rolls to move. If the ground is uneven, a sudden jolt from hitting a bump can cause it to explode.
Prof. Lotus' Notes: It's shiny form looks like a great ball. A popular fan theory is Voltorb is a Pokeball possesed by a vengeful ghost Pokemon, and people are always quick to point out the similarities between Voltorb and Haunter when it comes to the eyes. However, one thing is certain, there is a link between Pokeballs and this Pokemon.