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GS Ball Bulbapedia
The GS Ballis a special and mysterious Poké Ball. It is colored gold and silver and has the letters “GS” inscribed upon it. GS may stand for Gold and Silver, as those were the first two games of Generation II.
In the Japanese version ofPokémon Crystal, players could use thePokémon Mobile System GB to obtain a GS Ball as an event item whichthey could take to Ilex Forest. Using it at the forest’s shrine wouldprompt an encounter where a wild Celebi could be captured. However, noequivalent event was ever offered to players of the English version ofthe game, thus rendering the GS Ball unusable, and under normalcircumstances, unattainable. A modified version of the Celebi Eggglitch will spawn a GS Ball as a held item.