Okay, so I've combined all 3 parts of the game. As I played, I unlocked all the monster entries and attacks from both Chapter 1 and 2. According to the Wikia, doing so unlocks the doppleganger entry. However, the entry is not there. I have the files,
Am I missing something, or does it not carry over to chapter 3?
Chapter 3 Doppel or the secret thing????
ExNoc
If you have the integrated MGQ1-2-3: after you have seen the 1st Black Alice/Ilias dialog once (the MGQ3 story start) - go to the Extra menu and click to the white dot below the menu.
If you have MGQ3 only - the method is same, but you must finish the game once to activate this "dot".