Breed a female Vulpix with a compatible "Ground" breeding type (not Pokemon type) or trade from another game.
get it in a trade
no
Cheating
Cheating, hacking, or trading.
i like balls
You can't unless you trade with some one who has it and got it from migrating or cheating with an AR.
You insert Pokemon leaf green go to route 201 or 202 and use the poke radar
You can't without cheating, trading, or migrating.
u can't
You can't, unless you have Action Replay, but there is no way you can get it without cheating or migrating...
The only way without cheating is to either get Pokemon yellow, which allows you to catch them all like you normally would without cheating, or I am afraid that you have to get them from trading with other people.
Growlithe is one of the "version-specific" Pokemon. Growlithe is only available in HeartGold, while in SoulSilver you can only get Vulpix.