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All areas, indoors and outdoors, are surrounded by a tiled image, or in the case of Generation IV, an empty area. For most routes and cities, this tiled area is comprised of trees or water, or even rocky cliffs; however, as indoor areas tend to take up a small part of the screen, they must be filled with a blank tile to complete the illusion of being just a small part of a continuous world.
In the core series
In Generation IV, the void is minimally programmed, as the player's location in Sinnoh's over world corresponds to the location they would enter in the Underground, and can be accessed through glitches, such as the Surf glitch and tweaking. Though the area between route and city areas remains covered in impassable trees, the void around an indoors area is, for the most part, clear to walking or running. Despite this, it can lock a player in, and the player can save here, leading to a potential need to restart the game from the beginning. However, accessing the void in Pokémon Diamond and Pearl can lead to a player being able to access Seabreak Path and Newmoon Island, and therefore the ability to capture Shaymin and Darkrai, respectively, without the need for an official event item.