Bulbapedia said:

The Pokémon Company has announced Pokémon 151, a new brand intended for adult Pokémon fans. An official Web site opens Thursday, and Japanese Pokémon Center stores have begun selling four types of stylized T-shirts. In addition, a Diamond and Pearl battle tournament for ages 15 and up will be held at the Tokyo store July 4.



The four T-shirts currently available for pre-sale feature stylized designs of Hypno, Cubone, Articuno and Mewtwo, respectively.