We finally discovered what Pokemon Movie 13 will be. Its that 4th Diamond/Pearl series movie. Very few details are known, and trailer has not been released yet (not even for japan). The legendary beasts (Suicune, Raikou, and Enteii) and Celebi will be featured in the movie.. It will also show Celebi using Time Travel. At some point in it, Ash may encounter a darker version of himself. It is known to be released in Japan at July 10, 2010 and unknown for the USA