One of the more interesting of the held items in the pokemon world is the bone club possessed by Marowak. Although those held by Cubone are initially taken from the tail of their Kangaskhan mothers, they actually grow larger with them as if the ghost of its mother is aging with the child, until the bone reaches its maximum size when the Cubone evolves into Marowak.
As weapons, they are exceptionally powerful objects, but also remarkably heavy. Indeed, it is only Marowak which can lift them, and only each Marowak can only lift their own bone: stronger pokemon such as Machamp who try find it easier to lift a Groudon. They can not be thrown with altitude and will typically strike an opponent in the legs; among flying-types, only the strongest of these pokemon can even hit a Pidgey with them.
They are not, however, only used as weapons. Marowak, bizarrely, find them to be comfortable pillows as well. And in the old days of the pokemon world (and still today, in some rural areas) before many other musical instruments were discovered, it was common to find Marowak playing a special type of drum also made of bone with their clubs. The sound produced is a deep, soulful one, thought to reflect that, for all the strength they display, some part of the Marowak's spirit remains touched by loss and grief, but is loud enough to reflect that they fight through it and live on.