Fire-Red Pokedex Entry for Charmander: From the time it is born, a flame burns at the tip of its tail. Its life would end if the flame were to go out.
Ruby/Sapphire Pokedex Entry for Charizard: Charizard flies around the sky in search of powerful opponents. It breathes fire of such great heat that it melts anything. However, it never turns its fiery breath on any opponent weaker than itself.