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Their dances are literally hypnotic and can throw even those with hardened wills into a trance. If many wild Hypossom are in one place and create a pack, they begin systematically attacking other nearby Grass-types and form a distinct territory.

Its flower petals deepen in color through exposure to sunlight. The arcing movement and glitter of the pendulum in a Hypossom's hand lull the foe into deep hypnosis.