LogFAQs > #947486815

Most of Gen 1's glitches were well hidden, most casual players wouldn't notice that Focus Energy eliminated your critical hit or some moves have a 1/256 chance at missing. Things like Missingno required very specific things to be done that almost no one would have found it if it wasn't for the internet (and in fact the glitch ended up adding to the game due to all the "secret Pokemon" rumors).

The only thing that players would have caught was the game incorrectly labelling a move as super/not very effective

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Congratulations to azuarc for winning the guru challenge