Sonic Adventure DX cheats: Battles

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Defeating the whale:
When on the whale stage(s), run over a speed ramp as soon as it appears. Then, do not press anything on the controller; the CPU will do the rest.

Defeating Chaos 0:
Get The Ancient Light. Do the Light Speed Attack on Chaos 0 and he will be defeated with one hit.

Defeating Chaos 2:
This trick requires Knuckles' Maximum Heat Gloves. When fighting Chaos 2, charge up Knuckles' Maximum Heat attack. Release B and Chaos 2 will use its shield. After a few seconds Chaos 2 will splash into a puddle, indicating that it has been damaged. Do this two more times to defeat Chaos 2. This strategy also causes you to lose your rings; do not forget to pick them up again.
Information in this section was contributed by Bnb4mj.

Defeating Chaos 6:
Wait until Eggman drops his freeze bombs. Then, use the homing signal to turn his bombs into eggs and throw them into Chaos' mouth. He should freeze. When he does, attack him. Repeat this as many times as needed.

When playing as Knuckles, get the Fighting Gloves then go to the trial (if you have already completed the game). If you have not completed the game, you can find the Fighting Gloves behind Big's house -- climb the wall, then go right until you find a ledge. When you fight Chaos 6, freeze him, power up, then get close to him and release the button. Repeat this two times.

As Sonic, use the Light Speed attack on him. His health gauge will go down until only half is remaining. Do the attack a second time to kill him. As Knuckles, use the Maximum Heat attack on him.

Note: This does not work with Big. Pick up the missiles that Robortnik/Eggman leaves on the ground and throw them at Chaos 6. He will freeze and give you a chance to do a homing attack him. Do this repeatedly and he will die. With Big, to defeat Chaos 6 fish to the circle when it appears. Get Froggy and you will win.
Information in this section was contributed by Vijay Reddy.

While you are fighting Chaos, Eggman will be throwing bombs onto the board. Hit a bomb and throw it into Chaos' mouth. He will freeze up. You can now attack him.
Information in this section was contributed by Vgamewiz.

Defeating Perfect Chaos:
When starting, get as many rings as possible. Then, go over one of the speed tracks to gain speed. Once you are glowing blue, speed straight for Perfect Chaos and you should hit him. Repeat this as many times as possible.

Hurt Perfect Chaos at less than maximum speed:
You can hurt Perfect Chaos without going top speed, although you have to be fast. Go onto the road and speed up. Stop moving during that until you are not in a Blue Shock ball, then quickly move into Chaos. If done correctly, you will hurt him without going at maximum speed.

Perfect Chaos face smash:
As Super Sonic, go to the fight with Perfect Chaos. Instead of hitting Chaos head on, go to either side of him. Try going into Chaos through his arm. If done correctly, Super Sonic will fly up and smash Chaos on his chin. Note: This does not do any more damage than the usual attacks.

Double Homing attack:
To do this, you need the Light Speed Shoes, Crystal Ring, and Ancient Light . Start the game as Sonic. Charge up to do the Light Speed Dash. Hold B then jump and do the Homing Attack. While Sonic is doing the Homing Attack, release B. Sonic will go further, and if you are close to a series of enemies, he will do the Light Speed Attack on them. Note: This requires practice.