Answer One: Get really lucky and you might win
Answer Two: The lottery number is the same with the Pokemon's ID number, so the more Pokemon you have, the better possibility of winning a lottery.
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In Pokemon Soulsilver, you can get a Net Ball from Johto in Goldenrod City. You have to win it from the Goldenrod Dept. Store lottery.
Sorry to disapoint you, but winning the Lottery does not get you a Master Ball in SoulSilver- I should know, I won once using a little trick I found ;) You only get a Max Revive.
the lottery is not in leafgreen.
You cant
You Win the lottery by luck and skills. But it's mostly luck that you need. To improve your chances, you can trade Pokemon with different ID's.