I found out not to use the cheat for 999 master ball. Use the code "any pokeball has a 100% rate" On this website. http://www.neoseeker.com/Games/Products/DS/pokemon_pearl/action_replay.html
Get rid of some of the master balls! the number of master balls you have is the number of the pokemon
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There is only one Master ball in Pokemon diamond so use it wisely. I hope you can find it!
how to catch dailga in Pokemon diamond use the master ball
Have a friend trade you a Pokemon holding the master ball they got.
giratina
number 148 is Azelf, you get it at one of the three legendary lakes. Try to get it in a master ball. Hope I helped!- Ashlie
darkriye
You get someones friend code -Pokemon Master
Use it on Palkia.
To get a master ball in Pokemon Diamond you have to beat Cyrus. You can also get one in the game corner.
if you beat the boss of team galactic, you will get a master ball from him