you can find a plain in Australia
they traveled with it
The Black Hills
you can find plains in the airport
Quebec, Canada.
White plains
If you mean: Dodrio... it can be found in Kisara Plains (Plains Capture Challenge).
One can find good information about the Great Plains in the Wikipedia article about the topic. It has information on location, boundaries, geology, climate, history and current uses of the Great Plains.
They usally find it in open spaces like the plains.
The High Plains
Africa
In Colorado, they are usually in the plains or in the mountains.
Diamond Plains