Legendary Pokémon

Red/Blue
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.
Gold
With its gas-like body, it can sneak into any place it desires. However, it can be blown away by 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
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.
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.
Fire Red
A being that exists as a thin gas. It can topple an Indian elephant by enveloping the prey in two seconds.
Leaf Green
Almost invisible, this gaseous POKéMON cloaks the target and puts it to sleep without notice.
Diamond
This Pokémon’s body is 95% made up of gases, which are blown away by strong gusts of wind.
Pearl
A Pokémon born from poison gases. It defeats even the largest foes by enveloping them in gas.