cianwood city
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go to cianwood and go to the medicine building
Go south, then east from the beach using surf, then go to the pharmacy and get the medicine.
you can't find a Charmander, you have to get a Charmander by trading a pokemon to a person that has a Charmander.
you find him in the ruins of alph by weeds and you can find smeargle on there same thing on Pokemon heart gold (natu evolves at level 25)(smeargle no evolvetion)
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'