How do you modifie the our in Pokemon diamond pearl?

You can modify the overworld by using the Pokétch application called Map Editor. To access the Map Editor, you must first obtain the Pokétch from Professor Rowan in Sandgem Town. Once you have the Pokétch, press the "Start" button to open the menu, then select the "Pokétch" icon. From there, select the "Map Editor" application.

The Map Editor will allow you to edit the terrain, objects, and buildings in the overworld. You can use the stylus to draw new terrain, place objects, and delete existing objects. You can also change the properties of objects, such as their size, color, and texture.

Once you are finished editing the overworld, you can save your changes by pressing the "A" button. Your changes will be applied to the overworld the next time you enter the game.

Here are some tips for using the Map Editor:

* Use the "Undo" and "Redo" functions to undo or redo your last changes.

* Hold the "R" button while drawing to draw straight lines.

* Hold the "L" button while drawing to draw circles.

* Use the "Zoom In" and "Zoom Out" functions to adjust the zoom level of the map.

* Use the "Layers" function to show or hide different layers of the map.