To unlock Driger V2, beat the Tournament, talk to Hillary and then go into the shop. Go to Buy Parts and to Bit Chips. Keep going to see Driger V2, Dranzer V2, Dragoon V2 and Draciel V2.
Dual Dragoon Bit Beast: beat the National Championship and talk to the DJ in the lobby.
Be DJ: beat DJ using Tournament mode and don't use any continues.
Be Daichi: beat Daichi using Tournament mode and don't use any continues.
Be King: beat King using Tournament mode and don't use any continues.