The Organization XIII Replica Data (XIII機関:再現データ Jūsan Kikan: Saigen Dēta ) are optional bosses found in Kingdom Hearts II Final Mix at the Garden of Assemblage. Once Sora, Donald Duck, and Goofy reach the Garden of Assemblage, they can access a computer that reveals portals corresponding to each defeated Organization member. The portals are labeled with their member's signature weapon and are arranged in the same manner as the thrones at Where Nothing Gathers. When used, a portal will transport Sora and his friends to a digital copy of the arena in which the member was defeated, where the Replica Data will materialize and attack Sora. In order for a portal to be operational, the Organization member or Absent Silhouette must have been previously defeated; however, the portals for the members fought at The World That Never Was are not operational unless the save file has been cleared. Once the Replica Data has been defeated, it simply decodes until the next time it is challenged. While the battles are extremely difficult, with enhanced stats and attacks far beyond those of their real counterparts, they are the most efficient way of farming Stat Boosts and Lost Illusions.
- Xemnas's Replica Data is fought at Memory's Contortion and the final arena, and relinquishes a Power Boost. Sora's equipment, items, and abilities can be reconfigured between the two rounds. While Donald and Goofy are not available as allies, Riku joins the party at the second battle.
- Xigbar's Replica Data is fought at the Hall of Empty Melodies, and relinquishes a Defense Boost.
- Xaldin's Replica Data is fought at the Bridge, and relinquishes a Defense Boost. Donald and Goofy are available as allies, but the Beast is not.
- Vexen's Replica Data is fought at the 11th Floor facsimile of The Old Mansion, and relinquishes a Lost Illusion.
- Lexaeus's Replica Data is fought at the Station of Remembrance, and relinquishes a Lost Illusion.
- Zexion's Replica Data is fought at the 3rd Basement facsimile of the Seashore, and relinquishes a Lost Illusion.
- Saïx's Replica Data is fought at the Addled Impasse, and relinquishes a Defense Boost.
- Axel's Replica Data is fought at the Basement, and relinquishes a Magic Boost. Donald, Goofy, and Roxas are not available as allies.
- Demyx's Replica Data is fought at the Castle Gate, and relinquishes an AP Boost.
- Luxord's Replica Data is fought at the Havoc's Divide, and relinquishes an AP Boost. Donald and Goofy are not available as allies.
- Marluxia's Replica Data is fought at the Station of Oblivion, and relinquishes a Lost Illusion.
- Larxene's Replica Data is fought at the Station of Remembrance, and relinquishes a Lost Illusion.
- Roxas's Replica Data is fought at the Station of Awakening, and relinquishes a Magic Boost. Donald and Goofy are not available as allies.
Weapon Symbols
Similar to in the Proof of Existence, the doors leading to the battles with each member of Organization XIII's Replica Data in the Garden of Assembledge display a silhouette each member's weapon. The only exception is Xemnas, the shield used by his Dragon Ship during the third portion of his final battle displayed, instead.
- Xemnas Replica Data Symbol.png
The silhouette of the shield Xemnas's Dragon Ship uses during the third portion of the final battle with Xemnas, which appears on the door leading to the battle with Xemnas's Replica Data
- Xigbar Replica Data Symbol.png
The silhouette of the Sharpshooter, which appears on the door that leads to the battle with Xigbar's Replica Data
- Xaldin Replica Data Symbol.png
The silhouette of the Lindworm, which appears on the door that leads to the battle with Xaldin's Replica Data
- Vexen Replica Data Symbol.png
The silhouette of the Freeze Pride, which appears on the door that leads to the battle with Vexen's Replica Data
- Lexaeus Data Replica Image.png
The silhouette of the Skysplitter, which appears on the door that leads to the battle with Lexaeus's Replica Data
- Zexion Data Replica Image.png
The silhouette of the Book of Retribution, which appears on the door that leads to the battle with Zexion's Replica Data
- Saix Data Replica Image.png
The silhouette of the Lunatic, which appears on the door that leads to the battle with Saïx's Replica Data
- Axel Data Replica Image.png
The silhouette of the Eternal Flames, which appears on the door that leads to the battle with Axel's Replica Data
- Demyx Data Replica Image.png
The silhouette of the Arpeggio, which appears on the door that leads to the battle with Demyx's Replica Data
- Luxord Data Replica Image.png
The silhouette of the Fair Game, which appears on the door that leads to the battle with Luxord's Replica Data
- Marluxia Data Replica Image.png
The silhouette of the Graceful Dahlia, which appears on the door that leads to the battle with Marluxia's Replica Data
- Larxene Data Replica Image.png
The silhouette of the Foudre, which appears on the door that leads to the battle with Larxene's Replica Data
- Roxas Data Replica Image.png
The silhouette of the Oblivion and Oathkeeper, which appears on the door that leads to the battle with Roxas's Replica Data