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 go down to the house next to the Pokemon center and inside is this guy, talk to him and he will give a secret potion.
Cynthia will give it to you.
You get the secret potion by talking to the pharmacist in Cianwood City. His house is in the south, south east of the gym.
cianwood city
Yes, beating the 7th Gym does not effect getting the secret potion.
secret potion. you can find it at the olivine city in that medicine shop.
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 go down to the house next to the Pokemon center and inside is this guy, talk to him and he will give a secret potion.
Valor Lakefront
Cynthia will give it to you.
You get the secret potion by talking to the pharmacist in Cianwood City. His house is in the south, south east of the gym.
cianwood city
If you mean super potion, buy it at the store. If you mean SpecialPotion to heal Amphy, Cianwood city across the ocean.
In Cianwood city there should be a Medical store up north of the gym and the man inside the store will give you the secret potion.
You need the Secret Potion, and you can get it at the Cianawood Pharmacy.
go to cianwood city using surf,go to the house with a sign,and if that sign says medicine house,go and talk to that guy,and he'll give you the potion.