Wears the skull of its deceased mother. Its cries echo inside the skull and come out as a sad melody.
– Pokemon Yellow Pokedex
Cubone’s Pokedex entries spell a sad story for the poor Pokemon. The entries suggest that Cubone is always born an orphan (even though Cubone can be bred without any ill effects on the mother Pokemon), and that it cries for its dead mother while wearing her skull. Apparently no one has seen Cubone’s face either, because it’s always covered by the skull.
For some reason, the Cubone and Marowak family has the most signature moves, 3, before Gen IV. The family has gets its own special held item, the Thick Club, which doubles Cubone and Marowak’s Attack.
Stat-wise, it has good Defense, but not much else; although if it’s holding the Thick Club, its Attack can be pretty good.