The Fire Stone is typically found in the following locations:
* Pokémon Red, Blue, and Yellow: It is found in Victory Road, accessible after you've defeated the Elite Four.
* Pokémon Gold, Silver, and Crystal: It is found in the Ilex Forest in the eastern part of Johto.
* Pokémon Ruby, Sapphire, and Emerald: It is found in the Fiery Path, a cave in the Hoenn region.
* Pokémon Diamond, Pearl, and Platinum: It can be found in the Veilstone Department Store, though it is a rare item to find there.
* Pokémon Black and White: It is available for purchase at the Castelia City Pokémon Center, which is a very expensive option.
* Pokémon X and Y: It can be found in the Shalour City Pokémon Center. It's available for purchase for a fairly expensive price.
* Pokémon Sun and Moon: It can be found in the Ancient Poni Path, a route in the Poni Island area.
* Pokémon Sword and Shield: It can be obtained from the Battle Tower by trading a certain amount of Battle Points.
Remember to check the specific locations based on the game you are playing.