Bismillaah Al-Hamdulillaah wa salatu wa salaamu ‘ala rasulullaah
Here is a fatwa from the Permanent Committee regarding the game, Pokemon. In the question, many evils of the game including its references to the Shinto religion is mentioned:
a- The six-pointed star: You rarely find a card that does not contain such a star. It is associated with Judaism, the logo and sign of the state of Israel, and the first symbol of the Masonry organizations in the world.
b- The cross: The game contains many forms of the cross which is the symbol of Christians.
d- Symbols of the Shinto creed: Shinto is a polytheistic religion that exists in Japan. The Japanese deify the sun, the earth and many plants and animals. The game contains many of these images.
In the answer of the Committee, they mention:
Furthermore, this game promotes and circulates the symbols of disbelievers and the forbidden images. It is also a form of consuming money unlawfully.
Accordingly, the Committee decides that this game, earnings gained through it, its sale or purchase are all prohibited, for it is a form of gambling that is forbidden by Allah and His Messenger. The Committee also recommends that every Muslim should be careful of this game and prevent his children from playing it to preserve religion, morals and creed.
May Allaah protect the Muslims & their kids from all evils and the plots of the Kuffaar.
Read the full fatwa @ answer of the Committee