There is no way to purchase a Timer Ball in Silver. You'd have to give it to a Poke'mon in Diamond, Pearl, or Platinum and trade it over. However, it may be obtainable through dowsing on the Poke'walker like the Dive Ball is. No guarantee on that, though.
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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
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.
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
You can buy them, at the Pokemon leuge thjey have evry kind of ball except master and cherish balls