Red/Blue: Almost incapable of moving, this Pokemon can only harden its shell to protect itself from predators.
Gold/Silver: Although it is a cocoon, it can move a little. It can extend its poison barb if it is attacked.
From this form, it will grow into an adult. As its body becomes softer, the external shell hardens.

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

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