Masterball

[Lightning Pikachu]

Where do you get the masterball in pokemon sapphire?

[Fossil Fusion]

Where do you get the masterball in pokemon sapphire?
You get it in Team Aquas base in Lilycove go around the teleporters until you fin it its got 2 electrodes round it looking like a pokeball

[Pika57]

Yeah in the Aqua base.

Also if you have six pokemon with the correct id number in the lottery, then you can get one.