from Cynthia
There is no legitimate secret potion cheat for Pokémon Diamond, Pearl and Platinum version. One way to do this would be to use an Action Replay.
The Psyduck are at the northern part of Route 210, standing in the way of the path. These are the Psyduck you will need to use the Secret Potion on.
Yes you do. You have to talk to the Team Galactic guy near the Great Marsh and chase him and he'll lead you to Cynthia. She gives you the Secret Potion.
you get secret potion from Cynthia after you chase galactic grunt in pastoria city
Cynthia is the Champion so you will see her when you beat the Elite Four
you need to get a secret potion to cure the kcklon just like in damond and pearl ecxpect psyduck
easy
go to the left of moo moo milk shop, then give the secret potion to the psyduck :)
there are no such things as peals on moshi monsters but there is black pearl of potion ocean. how to get the black pearl of potion ocean: type in your username and password. there is a box under password ans type in jkydpd7xctdr exactly how I typed it. login. open your treasure box and there you have it. add me. anne-pham
You get the secret potion by talking to the pharmacist in Cianwood City. His house is in the south, south east of the gym.
Black Pearl of Potion Ocean: JKYDPD7XCTDR
The Secret Potion is a Key Item which can not be discarded, sold or used until the required event with the troubled Psyducks.