First, go into the lighthouse. When you get inside, take the stairs. Do not take the elevator; It will take you to the room Jasmine is in, but the door to the area she is in is locked. So take the stairs. Go up to the fourth, count them, fourth floor (The enterance floor is the first, the next is second, then third and then fourth). On the fourth floor, there will be no stairs to go up. On the right wall, however, there is shining light on the floor. This is a window you can walk through. Walk through and you will be outside. Walk through the next door (Be sure to grab that Rare Candy on the left of the tower). Go up two floors and you will be on a floor with a sailor and a guy with a bald spot (Stay against the left wall and you can fight the sailor, but avoid the bald guy by walking around the sailor) Go up the stairs, and you will be in the room Jasmine is in (The one with the locked door) She will ask you to get medicine from the pharmacy across the sea in Chinwood. She will unlock the door so you can go. Now just take the elevator down, leave, and sail to Chinwood.
you need to battle the sailors
For me it didnt seem that tough all i needed to do was walk thorugh the front door
talk to jasmine in the lighthouse at olivine city and then go to cianwood and talk to the pharmasist
You must go get some medicine for her from cainwood, and bring it to her at the top of the lighthouse. Then she will return to her gym.
You find it in the Glitter Lighthouse in Olivine, or in the Celadon Dept. Store.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
The Lighthouse is in Olivine City.
level up your pokemon, and try as hard as you can to avoid some people
there isn't a pool
Ask the pharmasist in cianwood city to give you one then give it to the lighthouse Pokemon
You get it at the Cianwood City Pharmacy. It is used to Cure The Lighthouse Pokemon Ampharos. This answer is right-on. the pharmacy in Cianwood City in the Johto Region, and it is used to cure the ailling lighthouse Pokemon ampharos.
Get the secretpotion from a guy there and go back to Olivine in the lighthouse and cure the Ampharos in lighthouse and then battle Jasmine
talk to jasmine in the lighthouse at olivine city and then go to cianwood and talk to the pharmasist
Take the elevator at the bottom of the Lighthouse
You must go get some medicine for her from cainwood, and bring it to her at the top of the lighthouse. Then she will return to her gym.
You find it in the Glitter Lighthouse in Olivine, or in the Celadon Dept. Store.
Olivine city.
You have to go in the lighthouse and get the gym leader. Then you fight the gym leader and the guy in front of the town will leave and you will be able to get there.