* Alphamon
If you chose Agumon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and completing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done on Hard mode. If you chose Veemon or Dorumon in the beginning, go on the "Treasure Hunt" sidequest set by the Digi-Elfs in the Central Area. Complete the dungeon, and bring back the Sword Cannon Delta. This must be done on Hard mode. If you chose Guilmon in the beginning, complete Item Road after completing the game on Hard mode.
* Agumon
You can choose Agumon at the beginning of the game; or when Guilmon reaches level 17, you can go to the DigiLab and teach him the Agumon "Evolution Technique".
* Beezlemon X
If you chose Agumon in the beginning, complete Item Road on Hard mode after you complete the game. If you chose Veemon or Guilmon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and completing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done on Hard mode. If you chose Dorumon in the beginning, complete Item Road on Hard mode after you complete the game and collect twenty items. Note: You may need to do this on all Item Road quests on Hard mode.
* Black War Greymon X
Successfully complete the "Wormhole" dungeon on Hard mode.
* Clavis Angemon
If you chose Agumon in the beginning, complete the Undead Yard on Hard mode, killing all 302 enemies and have ten minutes or more remaining. You also need to activate all the "Concealment Gates". If you chose Veemon in the beginning, complete Undead Yard, defeating all 279 enemies within thirty minutes. If you chose Guilmon in the beginning, go on the "Ghost Extermination" sidequest in the "Shrine of Seals" and complete the dungeon with more than ten minutes remaining. This must be done on Hard mode. If you chose Dorumon in the beginning, complete Item Road after you complete the game, and collect twenty items there (may be optional).
* Dorumon
You can choose him at the beginning of the game; or when Agumon reaches level 17, you can go to the DigiLab and teach him the Dorumon "Evolution Technique". Note: The above could be level 16; when you reach level 16, go to the DigiLab and see if you can "digivolve" yet.
* Gallantmon Crimson mode
Go on the "Treasure Hunt" sidequest and bring back the Blast Gun Gamma; do this on Very Hard mode.
* Guilmon
You can choose him at the beginning of the game; or when Veemon reaches Level 17, you can go to the DigiLab and teach him the Guilmon "Evolution Technique".
* HeruclesKabuterimon X
If you chose Agumon in the beginning, then complete Item Road after you complete the game. If you chose Veemon in the beginning, go on the "Ghost Extermination" sidequest in the "Shrine of Seals" and complete the dungeon with more than ten minutes remaining. This must be done on Hard mode. If you chose Guilmon in the beginning, complete the Undead Yard, defeating all 279 enemies within thirty minutes. If you chose Dorumon in the beginning, complete the Undead Yard on Hard mode, killing all 302 enemies and have 10 minutes or more remaining. You also need to activate all the "Concealment Gates".
* Imperial Dramon Fighter mode
If you chose Agumon or Guilmon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and completing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done on Very Hard mode. If you chose Veemon or Dorumon in the beginning, go on the Ghost Extermination quest at the Shrine of Seals and sacrifice the "Defense ROM Delta". This must be done on Very Hard mode.
* Imperial Dramon Paladin mode
Successfully complete the "Wormhole" dungeon on Very Hard mode.
I think this digimon is the hardest to get and the strongest than other digimon.
* Metal Garurumon X
If you chose Agumon or Guilmon in the beginning, go on the "Treasure Hunt" sidequest set by the Digi-Elfs in the Central Area. Complete the dungeon, and bring back the Sword Cannon Delta. This must be done on Hard mode. If you chose Veemon in the beginning, complete Item Road after you complete Hard mode. If you chose Dorumon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and completing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done on Hard mode.
* Susanoomon
If you chose Agumon or Guilmon in the beginning, go on the Ghost Extermination quest at the Shrine of Seals and sacrifice the "Defense ROM Delta". This must be done on Very Hard mode. If you chose Veemon or Dorumon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and completing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done on Very Hard mode.
* Veemon
You can choose him at the beginning of the game; or when Dorumon reaches Level 17, you can go to the DigiLab and teach him the Veemon "Evolution Technique".
* War Greymon X
If you chose Agumon in the beginning, complete Undead Yard in under 30 minutes and defeat all 279 enemies. If you chose Veemon in the beginning, complete the Undead Yard on Hard mode, killing all 302 enemies and have ten minutes or more remaining. You also need to activate all the "Concealment Gates." If you chose Guilmon in the beginning, complete Item Road after completing the game. If you chose Dorumon in the beginning, go on the "Ghost Extermination" sidequest in the "Shrine of Seals" and complete the dungeon with more than ten minutes remaining. This must be done on Hard mode.
* Were Garurumon X
If you chose Agumon in the beginning, go on the Ghost Extermination sidequest in the Shrine of Seals and complete the dungeon with more than ten minutes remaining. Do this on Hard mode. If you chose Veemon in the beginning, complete Item Road after you complete the game. If you chose Guilmon in the beginning, complete the Undead Yard on Hard mode, killing all 302 enemies and have ten minutes or more remaining. You also need to activate all the "Concealment Gates". If you chose Dorumon in the beginning, complete Undead Yard, defeating all 279 enemies within thirty minutes.
* Modes and MP Techniques
The following can be done while playing in either single player or multi-player mode. However, for the mode to become unlocked in multi-player, you must switch your players to the first slot.
Hard mode: Successfully complete Normal mode; this applies to player one only. To unlock it for other players, switch them to the first slot.
Super Hard mode: Successfully complete Hard mode; this applies to player one only. To unlock it for other players, switch them to the first slot.