I think the game is aiming for immersion. Obviously, they can't promise pokemon in the real world. But they can make certain areas near where you live feel more important to you. That pond near your house? That isn't just a pond, that is home to the weird guy with 6 magikarps.
The forest with a path going through? Maybe there's someone having fun with a themed team of bug and grass pokemon!
But also, you will hear on the news how some kid went to the local power plant and died by some tragic accident trying to get Zapdos.