Void

The void is the name of the out of bounds region in Generation IV games, named as such for its pitch black appearance, and general ease of navigation in Pokémon Diamond and Pearl. The most important technical property of the void is that the map ID (which is a 2-byte integer that determines which city, town, route, or building the game thinks the player is in) is read from an invalid area of the MatrixLayout, potentially out of bounds for the RAM buffer. Notably, they may come from RAM regions, such as the Mapdata, that is changed by the act of entering a new map ID itself. By strategically rewriting those RAM regions, efficient voidroutes are found that allows the player to travel to any desired map ID. Travelling through voidroutes is known as void exploration, or voiding for short.

The void should not be confused with the abyss, which is a pitch black region created by tweaking. Although abysses are commonly used as an entry point into the void, they are not themselves out of bounds (and their glitchy properties only come from sections of the map not being properly loaded).

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