The Pokémon Center online website has updated with a new line of products called the Pikachu Stationary Collection [sic]. The products all feature Pikachu somewhere on the item. A Luxury Ballpoint Pen with Pikachu Pattern (Silver) features a warning that states: "This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. Not recommended for use by children." It is unclear which chemical included in the pen is a carcinogen as the warning doesn't state what it is.

Luxury Ballpoint Pen with Pikachu Pattern (Silver)

Pikachu Stationary Collection

Source: http://www.pokemoncenter.com/Pikachu-Stationary-Collections/b/9876693011