This was a really popular stance for some religious extremists years ago. It mostly stemmed from the "evolution" mechanic introduced in the first Pokemon games, which some people thought was equitable to Satanic overtones.
It was this old thing from back in the 90's. Crazy religious people saw Pokemon and instead of trying to understand what it was about, they let their minds run wild and filled in the void of knowledge with insane bull****.
More of a Pokemon fan than TherianReturns will ever be. "A person is smart. People are dumb, panicky dangerous animals..." - Agent K.
Some Pokemon are based on mythological demons like Ninetales That and religious extremists don't let their kids play anything with magical elements. I had a friend in high school that was not allowed to play Dungeons and Dragons so Pokemon isn't the only thing accused of this.