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Red/Blue Leaf Green Almost incapable of moving, this Pokémon can only harden its shell to protect itself from predators.

Yellow Able to move only slightly. When endangered, it may stick out its stinger and poison its enemy.

Fire Red This Pokémon is in a temporary stage while making its body. It is almost completely unable to move on its own.

Gold Although it is a cocoon, it can move a little. It can extend its poison barb if it is attacked.

Silver From this form, it will grow into an adult. As its body becomes softer, the external shell hardens.

Crystal Nearly incapable of movement, it leans against stout trees while waiting for its evolution.

Ruby/Sapphire Kakuna remains virtually immobile as it clings to a tree. However, on the inside, it is extremely busy as it prepares for its coming evolution. This is evident from how hot the shell becomes to the touch.

Emerald It remains virtually immobile while it clings to a tree. However, on the inside, it busily prepares for evolution. This is evident from how hot its shell becomes.