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Glitches are an unintentional piece of program put into games that users can exploit for their benefit usually
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Yes, If you are talking about a computer program which i assume you are. A glitch is only caused by an error aka malfunction many programs have been created with out any glitches ( I also assume you are talking about video games.)
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The only way to hack is by downloading a hack program. I personally recommend nitepr.
Unfortunately, unless you have the same Program that Nintendo used to code the games and are able to save the data on your cartridge, you cannot fix glitches in Pokemon. The only way you can remotely do so, is to avoid the glitch all together.
The Clothing Glitches!