Glitch City Laboratories closed on 1 September 2020 (announcement). This is an archived copy of an article from Glitch City Laboratories wiki.
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This database, known as the DexDex, documents the effects of glitch Pokédex sortings in Pokémon Gold, Silver and Crystal.
These are possible to obtain with glitches, such as the expanded Balls pocket and arbitrary code execution.
Thanks luckytyphlosion for the effect pointers.