Pokémon : S3 | E27 – Going Apricorn!

Ash and his friends talk with Kurt and his granddaughter Maizie over some drinks. Maizie thanks the trio for helping to save the Slowpoke Well and her grandfather. Ash brings up Professor Oak's errand, the GS Ball, and hands it to Kurt, but the trio are left shocked when Kurt just declares that the GS Ball is some kind of Poké Ball. Kurt apologizes for not knowing much about it, but reassures them that he will look at it closer. Ash and his friends make a video call to Professor Oak and inform him that Kurt is now inspecting the GS Ball. Professor Oak is pleased and urges them to report any new findings as soon as possible. Ash asks about Kurt's expertise, and Professor Oak explains that Kurt is a famous craftsman who makes special Poké Balls using Apricorns. When Ash asks what an Apricorn is, Professor Oak tells him to look at the tree growing next to Kurt's house. Having spotted the tree in question, Misty alerts Ash to a White Apricorn tree growing in the backyard. Professor Oak explains that Poké Balls made out of Apricorns have unique qualities that set them apart from regular Poké Balls. His mind set, Ash runs off to find Kurt and get himself an Apricorn Poké Ball of his own, leaving the Professor still on the phone.

Ash calls out to Kurt, but Maizie tells him to be quiet as it is hard work making Poké Balls. Maizie, Ash, and his friends watch Kurt perform more work on an Apricorn Ball before placing it back into the kiln. Ash then repeats his request, but Misty tells him to not be so rude. Kurt, though, happily gives the trio a Fast Ball each as a thank you for their earlier assistance at the Slowpoke Well. Maizie adds that the Fast Balls are from White Apricorns and are used to catch Pokémon that run away. She also explains that there are seven different Apricorn types, each making a different Poké Ball. Ash is eager to get an Apricorn Ball of each color and Kurt agrees, provided Ash retrieves the Apricorns himself. Maizie offers to take Ash up into the mountains to locate the other varieties, and he happily agrees. Team Rocket also happens to overhear the conversation and sets their sights on stealing the Apricorns to make money selling them.
(Source: Bulbapedia)