You can get in Routes 7 (west of Saffron City), 8 (west of Lavender Town), 36 (west of Violet City), 37 (south of Ecruteak City), and 48 (south of the Safari Zone).
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you can catch a growlithe at route 37.
Growlithe evolves into Arcanine when you give the Pokemon a fire stone.
Growlithe learns Flamethrower at Level 35
Growlithe evolves when you give it a fire stone
You'll need to trade for it from Pokemon HeartGold. It is not avilable in the wild in Pokemon SoulSilver.