After you beat Crasher Wake in Pastoria City, a Galactic Grunt will have set off a bomb Once you meet your friend outside, Crasher Wake will run outside.Run up to the Great Marsh and talk to Wake.While your friend will guard the Marsh, You follow the Grunt until he tires out and battles you.If you beat him, he will run away.Cynthia comes out and after a talk,she gives you the secret potion and a charm to give to her grandmother.
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Cynthia will give it to you.
The SecretPotion gets rid of the Psyduck on Route 210.
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.
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