In the lighthouse, take the stairs and ladders until you can't go up any further. Then, jump out the window on the right. Beautiful scenery... but anyways, continue your ascent up the lighthouse. After you talk to Jasmine at the top, do what you did in GSC (get the secretpotion in cianwood and bring it back to her).
ACCF: Name-Chris Town-Oblivion 1204-3349-5174 Pokemon Platinum: Chris 1677 0039 1771
Well you need to get to her first. on the final floor that it seems to be, go to what looks like a window and walk out, you'll be brought to the outside part where you can walk around to another part. Just follow the path inside to the upstairs, talk to her, then surf your way over to cinawood city to the medicine dude, fight the gym leader there if you wish, then go to the lighthouse and use the elevator this time to get to her and give her the medicine. Then she will leave.
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