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ryomaidol said:
Missingno. (Japanese: けつばん Ketsuban) is a dual-type Bird/Normal Glitch Pokémon. Due to the ease of which it can be found, it is one of the best-known Glitch Pokémon In later generations, other Glitch Pokémon are referred to as "a Missingno.", despite there being little relation to the one found in Pokémon Red and Blue, except perhaps via a shared number of 000. Missingno. appears due to an oversight in the programming of the Old Man's tutorial in Viridian City on how to catch Pokémon. When the game sets up the battle between the Old Man and a wild Weedle, it needs to change the player's name (temporarily) to "OLD MAN" so that it will display that name, rather than the player's entered name, during the battle. Due to the limited spazio on a Game Boy cartridge, the programmers decided to use the spazio where data for wild Pokémon found in the erba is stored (which is completely blank in Viridian City; only Surfing and Fishing data is used) to save the player's name temporarily. Normally, this would cause no abnormal activity, as this data is overwritten when the player moves to a different area. In all cities, however, this data remains blank, and so the data is never overwritten (as there is nothing new to overwrite it with), and thus, the data that was last entered (be it the player's name o the wild Pokémon data from another area) remains in place. This itself still causes no harm; however, an oversight in the programming of the tiles used to denote the puntellare, riva of an island marks them as equivalent to grass. As all water routes have no real erba on them, likewise, the data is not overwritten, and so whatever data is in the slots for wild Pokémon found in the erba is used, be it the player's name o wild Pokémon found elsewhere, such as the Safari Zone. 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 species of wild Pokémon the player encounters along the coast are determined da the third, fifth, and seventh characters of the player's name, while their levels are determined da the second, fourth, and sixth characters, respectively. da knowing which letters and symbols correspond to which species and levels, through the use of certain calculators and charts (such as ), it is possible to set the name of the player at the start of the game to find specific Pokémon at specific levels.
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