Dennou Senshi Porygon (Computer Warrior Porygon) or Electric Soldier Porygon (Episode 38)
It had to do with Ash in some dimension with porygon and pikachu's thunder and team rockets gun(some light gun thing). When they hit, they flashed intense alternating red and blue light and the light made several Japanese people have epileptic seizures.
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Pokémon Episode 38 was the Porygon-related episode that sent hundreds of people to the hospital with serious seizures so the government in Japan banned it which means no one is capable of airing it.
Pokemon episode 388 - "who, what, when, where, wynaut?"
there no Pokemon episode when misty meet dawn
Episode 1 of Season 10 OR if your counting all of the episodes of Pokemon Episode 467
Episode 1. He saw Ho-oh