Successfully complete the game and save when prompted
after the credits. Load the cleared saved game file. Go to the
entrance of the prison and talk to the guard. Select the first
response when he asks if you are a true adventurer. The monsters
will become more challenging. To have them return to their normal
difficulty, talk to the guard again and select the second response.
10 Development points
Create a character with a nine character name. You will then have 10 points to add to any stat.
Note: This trick requires two PSPs with their own copy of the game. Start a Co-op mode game with the other PSP. Complete the game and trade. Send all your items to the other PSP, then quit the game without saving. Your items will all be on the first PSP, while their copies will be available on the second PSP.
Note: This trick requires two PSPs with their own copy of the game. Start a Versus mode game with the other PSP. Offer all your money. Intentionally lose and quit without saving the game. You will not lose all your money, and the second PSP will still have the amount given.
Strategy guides from GameFAQs