you find it after you go to the team galactors base and free the 3 lake Pokemon. it should be in Cyrus' office and the other way is to go to the lottery and you get given a number and if one of your Pokemon match all 5 numbers you get a masterball every time you match them, the best way to win is to get lot of Pokemon for trades as they have more chance to match up. hope this helps
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You get it when you beat the Galaxy Leader in the Base in Veilstone City. He brings it to you!
going to the Pokemon league on a sandbar
You find or get it at Route 210.
no
After you defeat Giovanni in Sliph Co. the President will give you the MASTER BALL.