How do you get Zero Gear for Roxas

The Zero Gear can be obtained once the game is completed. Upon completion of the game a save option will appear. After loading the save-file the Zero Gear will be a new item at the Moogle Shop for 30000 heart points.

NOTE: If you equip three ability units to Zero Gear on Mission Mode you play as 'Dual Wield Roxas'. (Roxas wielding the Oathkeeper and Oblivion keyblades)