GS Ball

The GS Ball is 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 & Silver versions, the original GameBoy games that took place in the Johto Region before Crystal version, the version that introduced GS Ball.

In the anime

Professor Ivy had called upon the help of Professor Oak to study it, but couldn't figure out how to open it or transmit it via PC. So Professor Oak asked Ash to go to the Orange Archipelago and get it from Professor Ivy. This prompted Ash's participation in the Orange League.

When Professor Oak couldn't do anything with it, Ash was once again asked to deliver it to Kurt, a Poké Ball researcher and manufacturer living in Johto's Azalea Town. It still resides there to this day, and its purpose is, as of 2006, unknown.

In Pokémon Crystal

Players could use the mobile phone system to gain a GS Ball that they could take to Ilex Forest. Using it at the forest's shrine would prompt an encounter where a wild Celebi could be captured.

In the Pokémon Special manga

The GS Ball was created by the Mask of Ice - using the feathers of Lugia and Ho-Oh - to capture Celebi. Only the feathers of the two Legendary Pokémon could contain Celebi, and prevent their holder from suffering the ill effects of time travel. Gold was able to use his Pichu to destroy it and set Celebi free.