you go to cianwood city. but you have to surf there.
Edit: Actually, you have to go to Cianwood before you beat Jasmine. After you beat her go east past Mahogany to Blackthorne City and face the 8th Gym.
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beat the Pokemon luegue then go to the Pokemon centre
you need strong Pokemon or find i a gastly in the sprout tower and lvel that up to about fifteen because then none of her moves will work on u so it is easy to beat her
nothing
Jasmine is in Diamond / Pearl. She doesn't do much of anything
There were hints for the new Pokemon G/S remakes Heart gold and Soul Silver Because she wanted to participate in the super contest in Sinnoh