For Fire Red, I believe you could get 1 net ball in the game.
One of them is from the fisherman south of Lavender City, and if you catch a magikarp and give it to him and it is big enough, he will give you a net ball.
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yes, all you have to do is give it to your Pokemon and clone it.
Great Balls:fallabor town Net Balls:Mossdeep city.
you can not buy them, they can only be found in item balls.
there isnt any dusk balls in fire red, they were introduced in generation iv