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Red/Blue Leaf Green Almost invisible, this gaseous Pokémon cloaks the target and puts it to sleep without notice.

Yellow Said to appear in decrepit, deserted buildings. It has no real shape as it appears to be made of a gas.

Fire Red A being that exists as a thin gas. It can topple an Indian elephant by enveloping the prey in two seconds.

Gold With its gas-like body, it can sneak into any place it desires. However, it can be blown away by the wind.

Silver Its thin body is made of gas. It can envelop an opponent of any size and cause suffocation.

Crystal It wraps its opponent in its gas-like body, slowly weakening its prey by poisoning it through the skin.

Ruby/Sapphire Gastly is largely composed of gaseous matter. When exposed to a strong wind, the gaseous body quickly dwindles away. Groups of this Pokémon cluster under the eaves of houses to escape the ravages of wind.

Emerald When exposed to a strong wind, a Gastly's gaseous body quickly dwindles away. They cluster under the eaves of houses to escape the ravages of wind.