To get a Digivolution by having to end a side quest with 1 HP remaining, go to the Goblin level (this stage is the easiest). Make sure you have a Gate Disc with you. Fight and go to the area after the rolling barrels. When you get there and see the area where you must jump from the rock things to get to the other side, just fall. You will automatically be revived with 1 HP. Then, use the Gate Disc and return to the D.G.S. base. After your return with 1 HP, save the game. Next, go to the desired side quest that requires having 1 HP remaining to get the Digivolution. Note: While on the side quest, make sure you do not get hit by any enemies; this requires extreme practice and skill.

To get a Digivolution by having to end a side quest with 1 HP remaining in Card Retrieve on Hard mode, use the following trick. At the end there is a sand trap that will suck you in if you get too close to it. First, destroy all the enemies that can get in your way. Next, jump into the sand trap. You will be revived with 1 HP remaining. Note: When facing the master of the side quest, try to use MP type attacks or a gun type weapon.