SABLEYE lead quiet lives deep inside caverns. They are feared, however, because these POKéMON are thought to steal the spirits of people when their eyes burn with a sinister glow in the darkness.
SABLEYE digs the ground with sharpened claws to find rocks that it eats. Substances in the eaten rocks crystallize and rise up to the POKéMON’s body surface.
It digs branching holes in caves using its sharp claws in search of food--raw gems. A SABLEYE lurks in darkness and is seen only rarely.
It feeds on gemstone crystals. In darkness, its eyes sparkle with the glitter of jewels.
It hides in the darkness of caves. Its diet of gems has transformed its eyes into gemstones.
— Pokédex entries (via PokeAPI)