Indeed. And computer games, alcohol, the Internet, hard drugs, pornography, homosexuality, ...
Well, any time such a thing has a remote connection with a fantasy world, anyway. I don't recall demonic pronouncements about StarTrek.
Oh, that caused enough trouble in its time, though for different reasons. As I recall, Captain Kirk kissing Lieutenant Uhura (the first onscreen kiss between a white man and a black woman I believe) caused mass-hysteria in some parts of the US.
On the other hand, the number of 'Pika-thulus' I saw at the Comic-con can only add to the theory with regards to pokemon :) --Kazuhiko
When it comes to Pokemon, it is quite possible that "they" might be right about its negative effects.....(like it's being crap ^_^)