Error prevention and placeholders in the Pokémon games:
?????????? | ????? | ! | Abnormal Pokémon | Bad Egg | Enigma Berry (Generation III) | Error! | Error codes (Generations I and II) | Error traps for damaged save data | Error traps to prevent impossible progress | Event data debugging messages | Instant victory effect (Generation II) | Mystery Zone | N/A | Pokégear instruction booklet trap | Rhydon trap | Special (location) | This Game Pak is designed only for use on the Game Boy Color. | This Pokémon cannot be traded.
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?????????? | ????? | ! | Abnormal Pokémon | Bad Egg | Enigma Berry (Generation III) | Error! | Error codes (Generations I and II) | Error traps for damaged save data | Error traps to prevent impossible progress | Event data debugging messages | Instant victory effect (Generation II) | Mystery Zone | N/A | Pokégear instruction booklet trap | Rhydon trap | Special (location) | This Game Pak is designed only for use on the Game Boy Color. | This Pokémon cannot be traded.
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Unused maps and placeholder map names within the Pokémon games
Alternative map locations (Generation I) | Alternative Route 104 map | Battle Park (Platinum) | Generation II Safari Zone | Haunted House | Jubilife Condominiums floors 3 and 4 | Map 0x0B (Generation I) | Map 0x6F (Generation I) | Mystery Zone | Record Corner (FireRed/LeafGreen) | R/S Flower Shop (Festa 2002 demo) | Special (location) | Special Area | Sevii Islands 8 and 9 | Unused Olivine City house | Unused Sunyshore City house | Unused Celadon City house
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Alternative map locations (Generation I) | Alternative Route 104 map | Battle Park (Platinum) | Generation II Safari Zone | Haunted House | Jubilife Condominiums floors 3 and 4 | Map 0x0B (Generation I) | Map 0x6F (Generation I) | Mystery Zone | Record Corner (FireRed/LeafGreen) | R/S Flower Shop (Festa 2002 demo) | Special (location) | Special Area | Sevii Islands 8 and 9 | Unused Olivine City house | Unused Sunyshore City house | Unused Celadon City house
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In the English version of the game, the location name was not translated and was rather localized as N/A; removing the intended meaning of the string.
It is speculated that the Haunted House may have been inspired by the ghost-related legends of Himeji Castle in Kōbe City, a port city compared with Olivine City.
Furthermore, it is not known whether this location has any significance to the Old Chateau (Japanese: もりのようかん, Forest Manor); which is an actual haunted house that was introduced in Pokémon Diamond and Pearl, but contributing to this possibility is the fact that Sweet Honey was another feature introduced in Diamond and Pearl but intended as a feature in Pokémon Gold and Silver, in addition to mine cars and tracks (introduced in Diamond and Pearl in Oreburgh Mine).