Help on Pokemon Pearl Post-National Dex Please!?

I have defeated the Pokemon Champion, seen all 150 Pokemon on the Sinnoh Pokedex, got the National Pokedex and Pokeradar, and I cannot find Growlithe, Nidoran(m), or Nidoran(f) on Route 201 or Route 202! I have my Pokemon Firered game inserted in the Gameboy Advance Slot of my Nintendo DS and I have used the Pokeradar like crazy in this area. Also, I haven't recieved a Crown for my Accessories Case from the girl on the 2nd floor of Pal Park and I can't transfer my Pokemon from Firered to Pokemon Pearl! Any suggustions? I am getting tired of constantly looking for those Pokemon.