after talking to jasmine go to cianwood and go to the south most house go and talk to the man at the desk he should give you the medicine
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Surf to Cianwood and visit the pharmacy there.
You can only get the SecretPotion after you have talked to Jasmine in the Olivine Lighthouse. Then she will ask you to get Ampharos some Medicine. You go to Cianwood City and talk to the guy at the Pharmacy and he will give you SecretPotion for Ampharos.
cianwood city
I have HeartGold and in Cianwood theres a store there and go in and he'll give you the SuperPotion or something like that. Give it to Jasmine and then Ampharos will light up.Pokemon soul silver the Pokemon in the Olivine City Lighthouse Needs medicine, you can get the medicine in the Cianwood City and you get it in the pharmancy next to the medical center
The medicine for the lighthouse Pokemon (ampharos) is in cianwood city. Get the medicine and return to olivine. Deafeating the gym will make this easier because you will be able to use fly, once you defeat the gym and walk out the lady will give you the hm for fly. Return to olivine and cure ampharos then you may battle the gym and its leader which is the person who was taking care of ampharos.