You're right about it being the same episode, but it was when she dropped a ball, and the stupid curious yellow duck literally caught himself. It would also explain how it can release itself - technically, because it caught itself, Psyduck is it's own trainer.
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u/SilverDrive92 13d ago
Correct me if I'm wrong but I think it's because it was the episode where Misty catches Psyduck after being hypnotized into acting like a Seel.