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This is the cheat (gameshark code) for unlimited master balls as long as you keep refreshing the code. 00000554000A354475830050000000 233423155230
Use master balls. Use a ton of ultra balls and put them to sleep or paralyze but master balls are your best bet since leaf green is harder than its original counterpart
You can get them on route 228
Have a friend trade you a Pokemon holding the master ball they received.
As far as I know the only way to get more than one is on action replay. If you are trying to catch legendaries, other poke balls will work.
this might not be a quick as you think but if you collect all of the unowns then u can get ever lasting master balls
To get more than one Master Ball, you must trade Pokemon that are holding them to your game.
If u have emerald then just clone master balls at the battle tower and then give them to six Pokemon then migrate.
In Pokemon Diamond, Pearl and Platinum you can get one master ball from Master Cyrus. To get more, you have to cheat using a Action Replay DS or DSI, or you can trade Pokemon with your friends and receive master balls from the Pokemon that they traded.
Which PokeBall?If you don't have a Master Ball anymore, then use Dusk Balls more than Ultra Balls at night; Dusk Balls have better chances of catching than Ultra Balls at night. If you can't wait until dusk when it's daytime, then you'd use Ultra Balls.
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there are two ways you can get a second master ball is to trade someone a Pokemon holding a masterball or by hakingIt is impossible unless you want to hack. Google search for "gameshark".