It was not a bug =/ it was a bunch of unused binary combinations.
For example, 00000001 is bulbasaur, 00000010 is invysaur, 00000011 is venusaur, 10000000 exists as a pokémon, however, anything after 10010111, which is 151 (Mew) is called "Missing Number", and is a possible combination for the rest of binary numbers, which has not been used.
A bug is a badly made script, not a script that has not been made at all. The Missingno.'s are numbers that have not been used, except for the image of some.
What is a bug is not the existence of Missingno. itself, it's the Old Man battle system, which deletes some information you require, and when you go to specific places, also bugged, you find pokémons related to your name.
As you find pokémons related to your name, you may also find pokémons with the unused binary combinations, this is when missingno. appears.
In Pokémon Yellow, it was not Missingno. that was fixed, it was the Old Man battle system, so you can also find Missingno.'s with the Mew Glitch
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It might not have been supposed to be encountered, but it was supposed to exist.
For example, 00000001 is bulbasaur, 00000010 is invysaur, 00000011 is venusaur, 10000000 exists as a pokémon, however, anything after 10010111, which is 151 (Mew) is called "Missing Number", and is a possible combination for the rest of binary numbers, which has not been used.
A bug is a badly made script, not a script that has not been made at all. The Missingno.'s are numbers that have not been used, except for the image of some.
What is a bug is not the existence of Missingno. itself, it's the Old Man battle system, which deletes some information you require, and when you go to specific places, also bugged, you find pokémons related to your name.
As you find pokémons related to your name, you may also find pokémons with the unused binary combinations, this is when missingno. appears.
In Pokémon Yellow, it was not Missingno. that was fixed, it was the Old Man battle system, so you can also find Missingno.'s with the Mew Glitch
It might not have been supposed to be encountered, but it was supposed to exist.
