Go up the stairs and all ladders u can then go through the window on the right
In olivine city.
Cinawood city, which is in the next town after the one with the lighthouse.
Secret Potion
in order to do that you have to help the lady in the lighthouse
you go to the city before the safarie zone.
The lighthouse is in Olivine city at the lower right corner of the city.
Lugia is one of them.
go to the town near the ocean. i forget the name. there go to the left and up some stairs
To get the medicine for the Olivine Lighthouse's Ampharos you must have a Pokemon that knows surf. Surf to Cianwood, get the medicine from the medicine shop, surf back to Olivine, and give the medicine to Ampharos.
you have to go through mt silver and fight red/Ash.
You need to have the move rock climb
there will be a secret door at olivines lighthouse and it will take you to jasmine then go back to the gym then jasmine will battle you