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Red/Blue Leaf Green Usually founds in power plants. Easily mistaken for a Poke Ball, they have zapped many people.

Yellow It is said to camouflage itself as a Poke Ball. It will self-destruct with very little stimulus.

Fire Red A life-form whose identity is unknown. It is said to Screech or suddenly Self-destruct.

Gold It rolls to move. If the ground is uneven, a sudden jolt from hitting a bump can cause it to explode.

Silver It was discovered when Poke Balls were introduced. It is said that there is some kind of connection.

Crystal During the study of this Pokémon, it was discovered that its components are not found in nature.

Ruby Voltorb was first sighted at a company that manufactures Poke Balls. The link between that sighting and the fact that this Pokémon looks very similar to a Poke Ball remains a mystery.

Sapphire Voltorb is extremely sensitive - it explodes at the slightest of shocks. It is rumored that it was first created when a Poke Ball was exposed to a powerful pulse of energy.

Emerald It bears an uncanny and unexplained resemblance to a poke ball. Because it explodes at the slightest shock, even veteran trainers treat it with caution.