Pokemon XIts body, which is made of soft silk, hardens over time. When cracks appear, evolution is near.

Pokemon YIt never forgets any attack it endured while in the cocoon. After evolution, it seeks payback.

Pokemon Omega RubyCascoon makes its protective cocoon by wrapping its body entirely with a fine silk from its mouth. Once the silk goes around its body, it hardens. This Pokémon prepares for its evolution inside the cocoon.

Pokemon Alpha SapphireIf it is attacked, Cascoon remains motionless however badly it may be hurt. It does so because if it were to move, its body would be weak upon evolution. This Pokémon will also not forget the pain it endured.