Thick Club is an item in the “Species-specific” category (Items). It costs ₽1000.
In-game descriptions
| Ruby / Sapphire | A bone of some sort. It can be sold cheaply. |
|---|---|
| Emerald | A hold item that raises CUBONE or MAROWAK’s ATTACK. |
| FireRed / LeafGreen | A hard bone of some sort to be held by a CUBONE or MAROWAK. It raises the ATTACK stat. |
| Diamond / Pearl · Platinum · HeartGold / SoulSilver | An item to be held by CUBONE or MAROWAK. It is a hard bone of some sort that boosts the Attack stat. |
| Black / White · Black 2 / White 2 · X / Y | An item to be held by Cubone or Marowak. It is a hard bone of some sort that boosts the Attack stat. |
| Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | An item to be held by Cubone or Marowak. It’s a hard bone of some sort that boosts the Attack stat. |
Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Held by wild Pokémon (Generation 3)
Common: 50% · rare: 5% (60% / 20% with Compound Eyes in the lead), from SetWildMonHeldItem.
| Rare |  Cubone  Marowak |
|---|
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h