Neo Granzon
Once you've completed Masaki's and Ryuune's route, your save file should have the letters "MR" meaning Masaki and Ryuune. Restart the game and on the Banpresto starting blue screen press "Down, Up, Left, Right, L, R" before the screen fades. It should turn pink and when you start Shuu's route, you will start with Neo Granzon instead of a regular Granzon.