It's because they threw that into the programming as a little Easter Egg to reflect how Pastoria City is obsessed with Croagunks.
Croagunk evolves into Toxicroak at Level 37. Also, if you wait one level, Croagunk will learn Poison Jab earlier than it would as a Toxicroak.
pokewalker route
It's a Croagunk.
Well at the Safari Zone you should be able to find him in there somewhere..
Safari Zone
Croagunk will attempt to evolve starting at Level 37.
the symbol Pokemon of pastoria is croagunk as shown in the Pokemon episode diamond and pearl #082 cream of the craogunk crop. since croagunk is its symbol they have a sign in pastoria to help you feel as awesome as croagunk by looking like it through the sign in platinum.
The Croagunk is there because of the Croagunk festival, as seen in one episode of Season 11 of the Pokemon anime called "Cream of the Croagunk Crop!".
you can find them in the great marsh
Yes, you follow the Croagunk into the Great Marsh and then catch them.
Croconaw evolves at level 38, not by a stone.
It's because they threw that into the programming as a little Easter Egg to reflect how Pastoria City is obsessed with Croagunks.
croagunk
You can go to the safari zone, but that is too hard. If you have beaten the game you can get it left of pastoria near the bog
i think you mean a croagunk. anyway it is found in the great marsh in pastoria city. it is very rare.
The ones that are exclusive to only pearl and platinum. The Pokemon include croagunk, glamor and purugly, and I think there's another one too