Before you start a mission you choose three mobile suits and you can switch between mecha in the heat of battle. Namco Bandai classified the mechs into three categories: close range type (Gundam 00 Qan(T) and Gundam DX), speed type (Z Gundam and Wing Gundam Zero), and shooter type (Kshatriya and Strike Freedom Gundam).
The following Gundam series are featured in this game:
Gundam Char’s Counterattack
Gundam W Endless Waltz
Gundam Seed Destiny
Gundam 00: Awakening of the Trailblazer
Gundam UC (Unicorn)
Gundam Memories has missions straight out of Seed Destiny, 00 (the movie too), and Unicorn to play in situation mode. Mission mode features new missions created just for the PSP game.