Here's how you can catch a Growlithe in Pokémon Platinum:
* Route 209: You can find Growlithe in the grass of Route 209. It's not a very common encounter, so you may need to search for a while.
* Eterna Forest: Growlithe is also found in the Eterna Forest. Again, it's not overly common but is more likely than Route 209.
Tips for catching Growlithe:
* Use a Pokémon with a False Swipe move: This will weaken Growlithe without risking a knockout.
* Use a Poké Ball with a high catch rate: Ultra Balls, Dusk Balls, or Timer Balls work well.
* Consider throwing a Poké Ball when Growlithe is paralyzed or asleep: This significantly increases your chances of catching it.
Good luck finding your Growlithe!