You need to be able to find Maylene, the gym leader, at the top of the lighthouse. To do so, you must jump out one of the windows in the lighthouse (I think on the 4th floor) and follow the stairs all the way up to the Gym Leader on the top floor. She will ask you to get a SecretPotion from the pharmacy in Cianwood City, and will unlock the door in the top floor of the lighthouse. Go to Cianwood Pharmacy and ask for the potion. Return to Maylene using the elevator in the lighthouse and give her the SecretPotion.
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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.
by using the Luna wing u get it from fullmoon island.
you get it at the games corner in Celadon. It can cure confusion in the middle of a battle
You cannot cure Pokerus yourself since once Pokemon are infected with it then they will keep it forever however each new day (up to 4 days) the game will decide whether to cure the infectious nature of Pokerus or not. Pokerus is a good thing to have since it will double the amount of EVs that the infected battling Pokemon will earn when an opponent Pokemon is defeated and as long as it remains contagious it can spread Pokerus to other Pokemon in your party however the game will not get rid of the contagious or infectious nature of Pokerus if the Pokemon is placed in a PC Box.
Go 2 Olivine. Battle a few trainers. the're easy 2 beat. then ou'll reach Olivine. Youre rival will B waiting outside the gym. he wont battle you but tell you that the leader isn't there. go 2 the lighthouse and take the stairs.(U cant do anything if U take the lift cause a door's locked after U get out of it) Battle until there's no way up. then U jump outta a window at the east.U'll B somwhere outside. U go in and battle some more until U find an Ampharos and a girl. She's the Olivine leader. She asks U 2 get medicine 4 the sick Ampharos. Go across the sea to Cianwood. (If you've been there before, fly.) On the island is a house with a man inside. He will give you the SecretPotion, which you then give to Jasmine so she can cure Amphy. She will then return to her gym. U can then battle her.