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Jolbat aggressively flies at targets, aiming to feast on blood. The amount of blood it consumes to be full is so minuscule, people regard it as harmless aside from the slight pinch of its bite.

While living in pitch-black caverns, their eyes gradually grew shut and deprived them of vision. They attach themselves to large-bodied Pokémon and absorb static electricity, which they store in an electric pouch.