Board Thread:Questions and Answers/@comment-5948952-20130722195909/@comment-5947062-20130722201145

To unlock the FALKEN in Zero, you will need first the 3 Supreme medals. You unlock them by finishing the game with a perfect ace style (perfect mercenary, perfect soldier, perfect knight).

Once you get the medals, the FALKEN will be unlocked in the hangar for purchase.

However, there is an easy way to unlock it, which would be by having a AC5 save file at the start of the game. If you also have an AC04 save it will unlock the X-02 Wyvern.