GEMAGA PEOPLE
There's no need to worry about the lack of DLC missions in the Western versions, because everything Japan has gotten can be used. This includes the super grind mission Gemaga, and Maximum Attack Cross (the hardest missions in PSPo2). Even Challenge Stage III is available, so you get more Extend Codes; not to mention loads of weapons exclusive to the Trade Missions. The downside? The text is in Japanese.
DOWNLOAD: http://www.sega-psp2.jp/pc/mission/ (click the bold yellow text above the small red text)
WHAT NOW!?: for the sake of simplicity make two folders ULUS10529DL & ULES01439DL! Copy the PSU2DOWN.DAT into both. Move both of these folder into X:/PSP/SAVEDATA/
The awesome thing about this is that you can play these Missions online as long as all members of your party has it.
Known Bugs/Conflicts: DLC Missions will not show up if in a Party with a player who does not have them; the mission just doesn't show up on the list. Also, if you do [The Kasch Test] without the JPN DLC, with someone who DOES have the DLC on, they won't be able to move. If you abandon the mission everything is fine.
Thanks Alexandria
Mod edit: Original info found here:
http://www.pso-world.com/forums/show...7&postcount=13