The secretpotion does not exist in SoulSilver, due to there being no use, therefore this question is void.
in the lighthouse in olvine city but you need the secretpotion then she will return to her gym and no trainers
there is not a secretpotion in Pokemon silver Daniel robertson
Olivine Gym, but you must have cured Ampy (in the lighthouse) with the Secretpotion from Cianwood.
You can only get the SecretPotion after you have talked to Jasmine in the Olivine Lighthouse. Then she will ask you to get Ampharos some Medicine. You go to Cianwood City and talk to the guy at the Pharmacy and he will give you SecretPotion for Ampharos.
you need to go to cianwood city's pharmacy shop talk to the guy and he will give u the secretpotion
to the pysducks ;)
Get the secretpotion from the pharmacy in Cianwood- yes it means ur gonna have to surf there and you probly wanna beat the gym there first- he's weaker @ lvl29-31. then give the secretpotion to jasmine to get her to go back to her gym.
A house in Cianwood has a guy who give you a Secretpotion. Use it on ampharos.
The serum you are talking about is actually called a secretpotion. You have to go to Cianwood City's pharmacy. Once you talk to the clerk, he'll give you the secretpotion to give to the Ampharos in the lighthouse.
you can't right away. you have to climb ladders to get to her then she unlocks the door (after talking to her) you leave to olivine city when you come back the doors will still be unlocked
in soul silver
you are going to need the HM surf, and then surf to cianwood city. there will be a pharmacy that gives you the secretpotion for free, but i recommend beating the cianwood city gym leader before heading back to olivine city.