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.
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Gary isnt a gym leader
claire
You battle the 8th gym leader, Clair, at Blackthorn City.
he is on cinnibar island
The Gym is in Violet City. Leader: Faulkner, Flying Type