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Here is what I found:

GS Ball
In the Japanese version of Pokémon Crystal, the GS Ball (G and S probably stands for Gold and Silver) is obtainable as a key item. It is obtained after using the mobile phone hook-up feature that was not made available US versions. A day after it has been delivered to Kurt, he returns it to the player and directs them to a restless Ilex Forest. Once the GS Ball is placed in the forest's shrine, Celebi appears and the player has a chance to capture it.

In the television series, Ash obtains the GS Ball from a Pokémon researcher, Professor Ivy in the Orange Islands. He is instructed to deliver the ball to his hometown's own researcher, Professor Oak. The GS Ball is a great puzzle. It cannot be opened or teleported and no-one can tell whether it has a Pokémon inside. After Professor Oak is in turn unable to figure out the GS Ball, Ash journeys to Johto and delivers it to Kurt, the Poké Ball master, in whose care it apparently remains. While the GS Ball appeared to play an important role throughout the series - several random scenes were shown throughout various episodes of Ash studying it, trying to figure out its origin - the GS Ball turned out to be apparently little more than a meaningless plot device; the thread was completely dropped despite allusions in its final episode that more information was to be revealed.

We both posted what we found rofl

They so did not just do that with the bike...