From Glitch City Laboratories
|Please note that this glitch only exists in the Japanese versions of the game, or is otherwise a glitch from a Pokémon game which was only released in Japan.
In the older builds of the Japanese versions of Pokémon Diamond and Pearl if the player was to enter and leave the Union Room from the second floor of the Pokémon League the next time the player uses an escalator to go to the second floor of any Pokémon center he or she will find himself inside of the 'void' and unable to escape.
The Broken escalator glitch is a miscellaneous glitch only existing in the older builds of the Japanese versions of Pokémon Diamond and Pearl. It is notable in the sense that it is one of only a few glitches officially acknowledged by Nintendo.
In these games, when a player exits the Union Room from the second floor of the Pokémon League, the next time the player uses an escalator to emerge on the second floor of any Pokémon center he or she will appear outside of the normal map area (i.e. the 'void'). As a result, the Broken escalator glitch is potentially dangerous in the sense that when the player saves the game he or she will never be able to return to the normal area of the map without any guidance or previous experience of the structure of the game layer corresponding to the overworld.
How to avoid the glitch (after returning from the Union Room)
This method is officially acknowledged by Nintendo. This method will not work if the player has already saved his or her game in the void.
- Turn the game off and then back on again.
- The player sohuld go to the Contest Hall in Hearthome City.
- The player should speak with the leftmost attendant, however he or she does not need to participate in a Super Contest.
- After saving the game and restarting, the next escalator will operate as normal.
-  - The broken escalator glitch, mentioned by Nintendo of Japan.