Sir/madam, you haven't defined how exactly it is that Pokémon is demonic. If you want to make your point, at least provide the basis for your argument.
Also, you may want to consider the tone of message you are using for witness. As a Christian, this comes across like a preachy rant, when we are supposed witness to other people in a loving manner (1 Corinthians 13:1-3).
I don't know if you'll read this or not, but if you do I hope you think about it.