This trophy is called "Break Time" and it requires the user to view an 'Interruption Message.'
In order to view an interruption message, and receive the trophy, the user must suspend their game mid-battle.
So, during a Scenario, press the Circle Button on an unoccupied map tile and select the bottom option, Suspend. With the Suspend Menu now opened, select the first option, "Save to hard disk drive" and save the progress of the Scenario. Once the save has completed, you will be asked if you wish to continue playing. Select "No" and enjoy the interruption message and trophy.