- This article is about the header. For the homonymous card from the Skyridge expansion, see Mystery Zone (Skyridge 137).
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The Japanese versions of Pokémon Platinum, HeartGold and SoulSilver identify the undefined areas as －－－－; however, they still identify a Pokémon's caught location set to the Mystery Zone as なぞのばしょ. This is because the two are different location IDs that share the name "Mystery Zone" in English games; whereas
0x0000 －－－－ is used for map IDs,
0x07DC なぞのばしょ is used for caught Pokémon. However, since no Pokémon are found in Mystery Zones, this ID goes unused.
The Mystery Zone is normally inaccessible, but can be entered by means of tweaking. In earlier copies of the Japanese versions of Pokémon Diamond and Pearl, the Surf glitch is an alternative method. It can also be accessed with the use of cheating devices.
Upon entering a map ID 0 "Mystery Zone" and accessing a location with a different map ID, the tilesets will not be updated even if the new area is programmed to use a different tileset. Simply refreshing the graphics will solve this. Sinnoh's Mystery Zone has its own tileset which can be seen by entering it from the overworld, refreshing the graphics there, and then returning to the overworld. This tileset is actually a slightly distorted depiction of the tileset shown in a pre-release screenshot of Pokémon Diamond and Pearl, indicating that it is a leftover from the development period. It also remains within the internal data of Pokémon HeartGold and SoulSilver.
On the 1.0 release of the Japanese versions of Diamond and Pearl, both the menu and the Explorer Kit are usable in a Mystery Zone. On later releases, the localizations, and Pokémon Platinum, neither the menu or the Explorer Kit can be opened (in HeartGold and SoulSilver, the touchscreen menu is locked), although a registered key item like the Town Map can still be used to refresh the graphics in the area at any time.
In the Generation V games, inacessible sections of areas use the header and background music of the location from which they were entered. For example, in Pokémon Black 2 and White 2, if the player keeps heading north of Route 19, going outside the boundaries of the map, the game will still recognize the location as being "Route 19" until the player arrives at another normally accessible location.
The "Mystery Zone" header (
0x0001 in Generation V,
0x0002 in Generation VI) in these generations is completely unused. The Egg received through the Bad Egg/Mystery Egg occurrence in Pokémon X and Y uses this caught/obtained location ID.
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