Literature
bad EGG
Back when Pokémon Gold and Silver versions came out, many players went on the hunt for bugs and glitches. The first glitches to be tried were those known from the first generation, notably the item and pokemon cloning tricks, wild missingno encounters, and pokemons above lvl.100. We had also heard rumors about shinies and the pokerus, but no one really knew what they really were nor if they were even real. It took quite a while before someone could confirm the existance of these 2 things, for they were so rare that even I, in over than 12 years of playing, never encountered them outside of trading with a friend who had pokemons infected