Desperation move:
Press R1 + R2 when the life bar is flashing.

Easy special moves:
Press R2 + D-pad (any direction).

Fight as Makendo Ichigo:
Press R1, L1, Circle, Triangle at the title screen.

Fight as Makenpo:
Press R1, L1, Circle, X at the title screen.

Fight as Manenpo:
Press R1, L1, Circle, Square at the title screen.