Secret Potion

The Secret Potion (Japanese: ひでんのくすり Secret Medicine), formatted as SecretPotion prior to Generation VI, is a Key Item in the Generation II and Generation IV Pokémon games.
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Price

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The Secret Potion is given to Jasmine in the Glitter Lighthouse to cure a sick named Amphy. Afterwards, she returns to the Olivine Gym, allowing the player to challenge it.

The Secret Potion heals a flock of who are blocking the way on  of their headaches.

Description

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Acquisition

 * Cianwood City Pharmacy (from pharmacist)
 * Valor Lakefront (from Cynthia)
 * Cianwood City Pharmacy (from pharmacist)
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 * Valor Lakefront (from Cynthia)
 * Cianwood City Pharmacy (from pharmacist)
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In the anime
,, , and Janina traveled to Cianwood City in Machoke, Machoke Man!, where they intended to buy the Secret Potion so Sparkle the Ampharos could be healed. Janina took the medicine back to Olivine City on an Express Ferry, while Ash and friends explored the Whirl Islands before returning to the mainland.

In the Pokémon Adventures manga
The Secret Potion appeared in Suffering Psyduck, where Cynthia used it to cure the Psyduck on Route 210 from their headache.

In the Pokémon Gold & Silver: The Golden Boys manga
🇬🇼 received the Secret Potion from Chuck in The Secret Of The Fighting Type Pokémon. It was then sent to Olivine City to heal Amphy. According to Chuck, the pharmacy that sold the medicine closed down ages ago, making his sample of it the only remaining one.

In the Pokémon Pocket Monsters manga
and his Pokémon went to Cianwood City in Light Up the Lighthouse!! in order to get a Secret Potion from a pharmacy. When they went in the pharmacy, the owner gave it to them after telling them a tale. While at sea, lost it, but took one of the pills prior to it getting lost. When Clefairy later ate the pill when their ship was approaching the unlighted Olivine Harbor, he started to glow, saving the ship from crashing.

Trivia

 * Other have a spray bottle as their in-game Bag sprite, but the Secret Potion features a pouch of pills. This is due to the Japanese name, Secret Medicine, not specifying the design of the medicine and not referencing the standard healing item.

In other languages
Geheimtrank Poción secreta Potionsecret Pozioni ひでんのくすり 秘传之药（道具）