You need the SecretPotion, which you get from the pharmacy in Cianwood City. You have to talk to Jasmine in the Lighthouse first before you get the SecretPotion.
You can not catch amphy
secret potion which you get by surfing to cianwood starting from the beach in olivine
Surf to cianwood from olivine and in a house a man sells it. He will give it to u though. Beat the gym and than fly back to olivine go to the top tower give it to AMphy and ur golden.
You must Surf to Cianwood from Olivine and get the medicine in one of the buildings. Then you must either Surf back to the Lighthouse or beat the Gym Leader, Chuck, and get HM Fly from the lady standing outside the Gym and Fly back to Olivine.
Amphy, the sick Pokémon at the top of the Olivine Lighthouse you must cure with the Secretpotion, is an Ampharos.
You must go to the Cianwood City Pharmacy.. :)
It is in Olivine City. You'll need to cure Amphy that is in the Lighthouse. (That's what Jasmine call the Amphoros.) Then she'll be in her Gym.
if you mean the medicine for 'amphy' in the light house, go to the medicine man in cianwood city he will give you a 'secret potion'
You can't catch Amphy. Amphy is owned by Jasmine.
Recieve from Cynthia after you've chased off the team galactic grunt to cure psyduck.
You first have to talk to the gym leader that is on top of the light house in Olivine City, she will ask you to go and get medicine for the Ampharos(Amphy) that powers the lighthouse. Then you go and talk to the guy in the Cianwood to get the SecretPotion.
go to the top of the lighthouse in olivine [stairs] then you see a window\door go through that go up the elevator the keep on going up then talk to the girl next to amphy than she sais something about cianwood medicine center surf to cianwood heal your Pokemon at the Pokemon center go up and you see suicune battle eucine go to gym beat chuck after gym a girl gives you hm fly go to medicine center get the secret potion get surf at dance academy in Ecruteak city at cianwood fly to olivine go up elevator in lighthouse talk to girl and amphy go to the gym battle gym leader