you can get it and any other ball at the Pokemon league and in solcoan town when the guy in the house next to the Pokemon center he will give you any pokeball and heart scales (you can't get masterballs and diveballs).
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You can buy them at the Pokemon mart at the Pokemon league. I buy my timer balls, heal balls, etc. at the Pokemon mart in canalave city
Hearthrome city
don't use cheats paralyz his butt false swipe him and use quick balls also have a Pokemon who knows mean look. Good Luck!
Quick balls don't exist in sapphire.
You can buy Quick Balls at random stores, just try 'em all. Another way to get Quick Balls, and others, too, is to find a different Pokemon each day for the article man. He'll give you three balls per Pokemon that he asks you to bring him.