3rd Gen What'stheGSball?

I
have
seen
it
in
the
anime
but
Ash
gave
it
to
Bill
and
we
never
heard
of
it
again
so
whats
in
it?

and
there's
rumors
of
a
GS
celebi
ball
event
in
R/S/E

The GS-ball has nothing to do with the GBA-section.

It was a mysterious ball in the anime that (orange islands adventures) Ash was given to by prof. Oak. Ash was ment to deliver it to prof. Ivy.

And NO, there are no such event in R/S/E, but i mean it is an Celebi-event in HG/SS or most likely B/W.

The GS Ball does nothing except in Crystal where it unlocks a Japan-only event.

It does not exist in anything except Crystal's data.