you can't buy heavy balls, but you can make them. you have to have grey aprecorns and go 2 the pokeball maker and give him the aprecorn and come back the next day.
=D
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You buy them at the Safari Zone, the shop right in front of the Pokemon Center (the girl with next to the Butterfree). Along with Quick Balls, she also sells Dusk and Nest balls.
buy it
at the pokeathalon
In the pokemarts. I think goldenrod
buy it a the store