Okay, but the only way I know how to catch Growlithe, is in Pokemon Diamond or Pearl, and 0_0 Platinum.
Things you need, DS,
Pokemon D/P or Plat. Game, Pokemon (GBA) Fire Red
Insert Pokemon Fire Red into the GBA slot at the bottom of you DS.
Then play D/P Or Plat.and go to route 201 or 202. And soon enough you'll find a Growlithe.
0_0 P.S. Growlithe evolves into Arcanine using a Firestone.