And of course, the most infamous one,
Beauty and the Beach, where James disguised himself as a girl with inflatable boobs. That episode was banned due to that and a few other things like an old man perving on Misty ("You remind me of my granddaughter!"), but it was aired on Cartoon Network in America once with heavy editing, and was never shown again.
In Japanese, the pervy old man says to Misty something like: "When you're eight years older, I'll date you!" Which highly implies that Misty is ten years old, and that the old man is a paedophile.
A few other episodes have also been banned because of some suggestive references, like the
Kangaskhan Kid episode where the father of the kid ogles Misty (again), and she angrily slaps him down with "I'm a person, you creep!" In Japanese it's even less subtle, with the father visibly ogling at her breasts.
Kids' show, they say.