From Bulbapedia, the community-driven Pokémon encyclopedia.
Kurt (Japanese: ガンテツ Gantetsu) is a Poké Ball smith who lives in Azalea Town. In addition to making his own custom Balls out of apricorn, he studies Poké Ball mechanics, and is known far and wide as a Poké Ball expert. He is Maisy's grandfather.
In the anime
Ash was sent to Johto to deliver the GS Ball to Kurt for study and found Azalea Town suffering through a drought.
Ash accidentally stepped on the tail of a local Slowpoke, and he was chased by an angry mob, but Kurt disguised him and his friends in Slowpoke costumes and saved them.
Kurt lived in Azalea Town, a town that considered Slowpoke sacred for their mythical abilities to cause rainfall. Ash and his friends met him while investigating Slowpoke Well because he heard strange noises coming from within. It turned out that Team Rocket was trying to steal the Slowpoke. Ash helped recover the Slowpoke and defeated Team Rocket.
Later, Kurt received the GS Ball. Ash wanted to see if Kurt would make him special Poké Balls. Kurt gave Ash, Brock, and Misty each a Fast Ball as thanks for helping them.
Ash and his friends gathered Apricorns and Kurt made Ash and Misty Lure Balls, and made Brock a Heavy Ball.
Kurt is apparently still studying the GS Ball; the mystery will probably never be solved.
This listing is of Kurt's Pokémon in the Pokémon anime.
In the games
Kurt lives in a house in the northwest corner of Azalea Town. After Team Rocket is out of Slowpoke Well, he will give players a Lure Ball. After this, he will offer to make his apricorn balls as long as he is brought an apricorn. By the next day, he will have crafted it into one of his custom Poké Balls depending on the color of the Apricorn. Additionally, in Japanese version of Pokémon Crystal, when player obtains the GS Ball, he/she brings it to Kurt. He examines it a whole week and next gives it back to player, then goes outside home and informs player that Ilex Forest is strangely restless. After that Celebi can be caught in the forest.
"Hm? Who are you? ???, eh? You want me to make some Balls? Sorry, but that'll have to wait. Do you know Team Rocket? Ah, don't worry. I'll tell you anyhow. Team Rocket's an evil gang that uses Pokémon for their dirty work. They're supposed to have disbanded three years ago. Anyway, they're at the Well, cutting off Slowpoke Tails for sale! So I'm going to give them a lesson in pain! Hang on, Slowpoke! Old Kurt is on his way!"
"Hey there, ???! The guards up top took off when I shouted at them. But then I took a tumble down the Well. I slammed down hard on my back, so I can't move. Rats! If I were fit, my Pokémon would've punished them... Ah, it can't be helped. ???, show them how gutsy you are in my place!"
"Thank you so much, ???! Now the town's Slowpokes are safe!"
"???! Thank you for saving the Slowpokes from Team Rocket! If you being me Bonguris, I can make Poke Balls like this! I am gald to give you my service! Do you have any Pokeballs for me to make?"
In the Pokémon Special manga
Silver got a Heavy Ball from Kurt, intending to catch an Ursaring with it. Kurt cautioned Silver that only experienced trainers could wield his special Poké Balls.
Later, Gold met Maisy and Kurt. Kurt explained that once, his ancestors were the only ones capable of creating Poké Balls until companies started to mass produce them. Kurt said that Gold wasn't experienced enough to use his special Balls, something that annoyed Gold.
Kurt made a Friend Ball for Gold, and later Gold and Silver were able to use their custom Poké Balls to capture a Teddiursa and Ursaring.
Later, the Mask of Ice forced Kurt to turn over his plans for the GS Ball.
In their youth, Professor Oak, Agatha, Kurt, Pryce, and the old couple who run the Goldenrod City Pokémon Daycare were all close friends. To try to cheer Pryce up, Kurt helped write the lyrics of "Riding On The Stars", which was also sung by DJ Mary after that.
This listing is of Kurt's Pokémon in the Pokémon Special manga.
Professor Elm • Professor Oak • Mom • Ethan • Lyra • Silver • Mr. Pokémon • Eusine • Lance • Red • Kiyo • Baoba • Magnus • Earl • Kurt • Carrie
Mary • Buena • Radio Director • Haircut brothers • Webster • Master • Li • Wilma • Primo • Maximo • Jet • Dude • Cameron • Mr. Game • Felicity • Teala
Team Rocket • Gym guide • Gym Leaders • Frontier Brains • Kimono Girls • Week Siblings • Name Rater • Day-Care Couple • Professors' aides