NOW THIS WILL ONLY WORK IF YOUR GOING TO EVOLVE YOUR EEVEE INTO VAPOREON.
I'm the person who asked what level growlithe evolves question a little bit ago.
Now when you are offered a stone from the sailor at the parts shop in the begining, take a firestone even though you want vaporeon, TRUST ME! When you get to Phenac City, the gym inside has a WATER STONE! you use that stone to evolve eevee into Vaporeon. Then in the SS Libra, there will be a firestone in there too. NOW YOU HAVE 2 FIRESTONES! NOW YOU CAN EVOLVE BOTH VULPIX AND GROWLITHE! it's too late for me to start over now in my game, so i hope I helped all you guys wondering the answer to this annoying problem if you don't have a DS or Gameboy or those games like me :D