You have to talk to the lady furthest away from the entrance when you go into a pokemart. It's only in some towns, like Saffron City and Azalea.
go to the safari zone and talk to the people in the stalls its one of the and u can buy the balls u want ........talk to all of them because i dunno which person it is
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You can buy the dusk balls in Pokémon Diamond at various markets in the game. The dusk balls cost 1000.00 a piece.
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
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't. they didn't exist in 3rd gen.
Once you get to go to the safari zone there will be a girl who will sell nest balls.