Just use PSP Video 9 to convert and a site for free psp games, would be isohunt.com, or demonoid.com, or mininova.org. Just type in the game you want and download! For example if you want Tekken 6 go to http://isohunt.com/torrents/?iht=-1&ihq=tekken+6.
a AVATAR , oh, it is a good one, but i have not seen it yet, en ,with a psp, en you in fact can use a video converter, convert it to the format that psp accept, en, look at this , just have a free try, i use it before :
http://www.iorgsoft.com/guides/mkv-to-psp/