You cannot get the GS Ball.
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you have to give Kurt a red apricorn next a black one the a white then a pink and he gives a gift of which you swap with mr Pokemon for a master ball
Give Kurt your desired Apricorn. Save. Go to your DS's system menu and change it's clock to 23:59. Wait a minute (0:00). Talk to Kurt.
You have to get a certain apricorn color and put it in your apricorn box which you get from the guy near Mr.Pokemon's house. You have to give it to Kurt who makes pokeballs from apricorns after you have gotten out of Illex forest.
Give Kurt in Azalea Town a Blu Apricorn, then wait one day and come back, at which point he'll give you a Lure Ball. He also gives you one after you save him from Team Rocket in the Slowpoke Well.
Give Kurt one of the Apricorns. Don't recall which one though...