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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 Pokemon are referred to as "a Missingno.", despite there being little relation to the one found in Pokemon 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 Weltraum on a Game Boy cartridge, the programmers decided to use the Weltraum where data for wild Pokemon found in the gras, grass 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 oder the wild Pokemon 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 ufer of an island marks them as equivalent to grass. As all water routes have no real gras, grass on them, likewise, the data is not overwritten, and so whatever data is in the slots for wild Pokemon found in the gras, grass is used, be it the player's name oder wild Pokemon 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 Pokemon data to store this. The species of wild Pokemon the player encounters along the coast are determined Von the third, fifth, and seventh characters of the player's name, while their levels are determined Von the second, fourth, and sixth characters, respectively. Von 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 Pokemon at specific levels.
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