after it learns flamethrower
Growlithe evolves only with a Fire Stone. You can purchase one at the Celadon Dept. Store.
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Growlithe doesn't evolve by level, but with a Fire Stone
I think it is only growlithe and arcinine.
You will need to use a Fire Stone on Growlithe in order for it to evolve, it will evolve into Arcanine.
In Pokemon Platinum, you can't catch an Arcanine, but you can catch a Growlithe and evolve it into an Arcanine. To catch a Growlithe, you have you use dual-slot mode with FireRed in the second slot and then you should have an 8% chance of catching a Growlithe on Routes 201 and 202 in Platinum.
Growlithe evolves into Arcanine when you give the Pokemon a fire stone.