Pokémon : S4 | E13 – A Better Pill to Swallow

Old Man Shuckle reveals his laboratory, packed with natural ingredients, but admits that there is a special secret to how his medicine is produced. He shows the group a storeroom, full of strange red containers with corks in them. Misty picks one up and is surprised to find that the containers are actually Shuckle. The old man explains that he fills the Shuckle shells with his ingredients until they turn into the juices that form the basis of all of his medicines. Different ingredients and Shuckle produce different medicines, and he shows the group a picture of a rare purple Shuckle, which can produce a juice that would allow its user to tame any Pokémon. Brock is extremely taken by this notion and asks the old man for some of the juice. However, Old Man Shuckle says that tracking down a purple Shuckle isn’t easy, although if he had help in finding it, he would be willing to share the juice. He introduces the group to Spoopy, a Bellsprout that checks the scent of Shuckle in order to see if the juice inside them is ready.
(Source: Bulbapedia)