The Thick Club (Japanese: ふといホネ Thick Bone) is a type of held item introduced in Generation II. It boosts the Attack stat of a Cubone or Marowak that holds it.
If held by Cubone or Marowak, doubles its Attack stat.
In Gold, Silver, and Crystal, if a Pokémon's stat reaches 1024 or higher (such as due to a held Thick Club), it will be reduced to its value modulo 1024.
Two Thick Clubs appeared in Showdown At Linoone amongst the items Tokin had picked up. One of them resembled the bone held by Marowak, while the other resembled that of Cubone.