For all secret items (including Langrisser and Alhazzard), try this. At the "Buy" word press left, up, down, right, left, select, right, up, left, down, right, select, circle

At the "Load" screen, highlight any of the scenarios (not the first one) and then press right, down, up, left, R1, square, start, select, triangle, circle.

At the "Buy" word press up, left, right, down, right, right, circle.

At the "Load" screen, highlight any of the scenarios (not the first one) and then press up, down, up, down, left, right, select, circle.