Wish Stone is an item which can be used to make Jirachi grant a wish.
The Wish Stone is first given by Medicham of Team Meanies as a reward of saving her from Wish Cave. If it was taken to 99F of Wish Cave, where Jirachi is, if the player turned down Jirachi’s request to join the team, the Wish Stone will wake it up and grant the player a wish. However, the item can be lost because of defeat or being sold.
Wish Stones can be found on 50F of Wish Cave.
It can be sold for $2, and cannot be bought.