extra master balls
To do this you need to have one of these gameboy games(emerald, sapphire, ruby, leafgreen, or firered)first, play through the gameboy game until you get the master ball for that game. Then give the master ball to one of your Pokemon to hold. After you do that migrate the Pokemon that is holding the master ball to diamond. And there you go. One extra master ball.
More tricks, tips and cheats for this game are right here - Pokemon Diamond cheats
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