To get the SecretPotion:
1. go up the light houses stares and ladders until you get to the top floor that you can reach.
2. on the right side there is big window. clime out and you will fall onto a platform. enter the door.
3. climb the ladders all the way up.
4. talk to the gym leader.
5. she will open the door then use the elevator to get to the first floor.
6. surf all the way to Cianwood City.
7. go to the pharmacy and talk to the man behind the counter. he will give you the secret potion. then you can just go up the elevater and the door should be open.
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Action Replay or Gameshark? You can look it up on SuperCheats.com
go to cian wood city go to the end and go into the middle house go to the counter and talk to the man
sorry you have to trade it to Pokemon soul silver
Well if it's the same in Heart Gold and Soul Silver you go up the lighthouse til you reach the top the the Pokemon will up there and the Jasmine girl will tell you to go to Cianwood City then you go to the house next to the Pokemon center and the guy should give you a secret potion.
Zorua is a 5th generation Pokemon it is not available in soul silver.