you can get dusk balls at the elite four hospital along with a bunch more different ones that are really useful.
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there isnt any dusk balls in fire red, they were introduced in generation iv
Go to Pastoria City and there will be two people at the counter. Press A in front of the guy on the left and he sells dusk balls, quick balls, and i think net balls.
You can buy the dusk balls in Pokémon Diamond at various markets in the game. The dusk balls cost 1000.00 a piece.
fuiif
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