You must surf on Routes 40 and 41 to get to Cianwood City. In the city, there will be a pharmacy where you can get a Secret Potion. Give this to Jasmine.
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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
go to cianwood and go to the medicine building
building near Pokemon center on cinnabar island
Surf to Cianwood and visit the pharmacy there.
You must first reach the top of the lighthouse. Once at the top, you will have to give her the Secret Medicine. Here's a short guide.GUIDE:Step 1. Cross Routes 40 and 41 to get to Cianwood City. In here, get the Secret Medicine from the Cianwood Pharmacy.Step 2. Head back to Olivine City and climb the lighthouse. Battle all of the trainers (if you have done this, then take the elevator up).Step 3. Give Jasmine the Secret Medicine and it will heal the pokemon.