The 3DS and PSP are both getting separate Gundam/Ultraman/Kamen Rider crossover games this year. While the 3DS gets Lost Heroes, the PSP will get Great Battle Full Blast. This is an action game where you pick a character, background music, and then get to work:
Great Battle Full Blast lets you select: Freedom Gundam, Gundam, Kamen Rider Decade, Kamen Rider #1, Ultraman or Ultra Mebius. In addition to these are 36 assist characters. Perhaps more characters can be unlocked later in the game.
Great Battle Full Blast is slated for release on March 1st.