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Whenever the game "sets up" the planned battle against the Old Man's Weedle, it needs to change the player's character name to "OLD MAN" so that it will display "OLD MAN" instead of the name the player has entered.
The programmers decided to use the area of data where wild Pokémon information is as a temporary storage area for the player's name, due to the lack of memory on a Game Boy cartridge. Normally this wouldn't cause any abnormal activity, as the correct data for the wild Pokémon available is written to this area in memory whenever the player travels to an area where it is possible to catch wild Pokémon.
Along Cinnabar Island's coast, however, there is no data indicating which wild Pokémon are catchable, and the same is true for both Viridian City and Cinnabar Island itself, at least by movement in long grass. The game uses whatever data was already in the corresponding area of data when determining which wild Pokémon encountered and their levels-- now the player's name. Normally this space in memory would hold the data of the last area visited where wild Pokémon were catchable in grass and their level data (this same glitch allows players to exit the Safari Zone and Fly immediately to Cinnabar Island to be able to catch and fight Safari Zone Pokémon in the same way as they would in other areas), however, since in both Viridian City and Cinnabar Island the data is empty for Pokémon obtainable in the grass, the active data is never overwritten, leading to Missingno.'s. availability, among other things.
The name of the player has six hexadecimal values in it. The game needs only three "slots" of wild Pokémon data to store this.
The wild Pokémon the player encounters along the coast are determined by the third, fifth, and seventh characters of the player's name, while the levels are determined by the second, fourth, and sixth characters, respectively.
in fire red i accidentaly saved after catching a missingno with my master ball anfd it turned into an egg that said it wouldnt hatch for a very long time will it ever hatch and if it does what will it be
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