The Tiny Mushroom is an item introduced in Generation II that can be bought for 3000 and sold for 250. These items are mainly hidden throughout each region. They are mainly found being held by wild Paras or Parasect 50% of the time excluding the Hoenn region games. This item doesn't do much, but be sold. They have an effect in Pokémon FireRed and LeafGreen, however. Two of these must be given to the Move Relearner on Two Island to allow a Pokémon to relearn one of its moves.
In the Johto region games, this item can be found in the Mahogany Town shop and other various locations in Pokémon HeartGold and SoulSilver. In the Hoenn region games, this item is hidden in Petalburg Woods. In Pokémon FireRed and LeafGreen, this item is found in various locations. In the Sinnoh region games, this item is found in various locations. While in the Unova region games, this item is found in Various locations and at the Black City shop in Pokémon Black. Two Generation V-introduced Pokémon, Foongus and Amoonguss may hold this item 50% of the time, like Paras and Parasect in earlier generations.