It’s true. Pokemon can give you seizures.
When if first aired in Japan, season one Pokemon episode, “Electric Soldier Porygon” was so flashy and bright that it actually sent 685 viewers to the hospital with complaints of headaches, nausea, and seizures. The event became known as “Pokemon Shock.” The show went on a four month hiatus afterward, and the episode in question has never been rebroadcast.
Reference: http://www.ugo.com/the-goods/cartoon-urban-legends