Give Kurt in Azalea Town a Blu Apricorn, then wait one day and come back, at which point he'll give you a Lure Ball. He also gives you one after you save him from Team Rocket in the Slowpoke Well.
Chat with our AI personalities
To get a Master Ball in Pokemon Crystal you have to defeat all the gym leaders then talk to professor elm. I advise you to keep the master ball for luigia.
The code is 91C089DA.
In poke marts
Using a master ball
All right all the pokeballs Kurt can make are: Fast ball, level ball, friend ball, heavy ball, lure ball, love ball, moon ball.