OI011: Bye Bye Psyduck

Episode Plot
Ash and Co. Arrive at Kinnow Island and meet a girl named Marina, who was just as crazy about Pokémon as much as Misty. They noticed that Misty's Psyduck's tail had begun to glow, meaning it was a sure sign it was ready to evolve. During a battle between Misty and Marina a Golduck Appears and Misty thinks her Psyduck evolved, but after the battle with Team Rocket, when Misty called Golduck back her Psyduck popped out, revealing that it never evolved so poor Misty is stuck with Psyduck.

Trivia

 * This was the episode that premiered worldwide the special Mini-Misty Lure.
 * Brock was mentioned by Misty in this episode because the Golduck she thought was her Psyduck evolved liked to flirt with girls, but unlike Brock, the Golduck is successful at flirting.

Quotes
Misty about the wild Golduck
 * "It's just a Pokémon version of Brock."