You can't. Trade it from Heart Gold.
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You have to catch a Growlithe, then give it a Fire Stone. It evolves.
You can't get a growlithe in soul silver you gotta trade it from heart gold.
You can't catch vulpix in Heart Gold, though you can catch it in Soul Silver. On the small route 37, Below Ecruteak City, you can find: ~Heart Gold = growlithe ~Soul Silver = vulpix (they both evolve using a fire stone)
you can only get growlithe in Pokemon heart gold,i would just trade that's what i did!sorry!
You can't catch charizard in Pokemon soul silver. You can get a charmander from professor oak.