you'll need a white apricorn to make fast ball, then go to Kurt to make it a fast ball.
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Blackthorncity's the only place in jotto
On the 2nd floor of Goldenrod Department store :P
By going to a pokemart in any town and buying pokeballs from there.
Attach your master ball to ONE POKEMON, next CLONE that Pokemon for how many master balls you want. Next detach them, and release all the clones (if you want)
Using a master ball