When you enter the first tournament and Hawk tournament, you will eventually face Aquaman. All you have to do is beat Aquaman and you will get AquaSoul. To use AquaSoul in battle, you must sacrifice an [Aqua]-Type Chip, then you may select the other chips normally. To get MetlSoul you must enter the Hawk tournament. You will face Metalman in the final round. Same thing. All you have to do is beat Metalman and you will get MetlSoul.If you are wondering why you can't get the soul of all the Navis you face, it is because you have beat them honorably.
Submitted by mega man fan 007