When taken to Devon Corp in Ruby, Sapphire and Emerald, or Oreburgh Museum in Diamond, Pearl & Platinum or Pewter Museum in HeartGold & SoulSilver, this fossil will be revived into the Pokémon Lileep. This item was a Key Item in Ruby, Sapphire & Emerald but you can obtain many in later games.
Lileep Level 20
Trainer Memo: ??? Nature. Date of Obtaining Obtained at Pewter Museum. Met at Level 20