From Glitch City Laboratories
In Pokémon Gold/Silver/Crystal, "N/A" refers to a specific error handler which appears in the index of map locations which are displayable on the Town Map. Its function however, is unknown, although it may act as a placeholder for undefined, or previously removed town map locations. It is not to be confused with the placeholder "SPECIAL", which although uses a hexadecimal identifier of 00, specifically denotes a location which will use the last town map location stored in memory.
- SPECIAL (Gold/Silver/Crystal)