Chaos 2

Chaos 2 is the second form of Chaos that appears in Sonic Adventure, as well as its remake Sonic Adventure DX: Director's Cut.

Knuckles the Echidna fights it in the Hotel Restaurant in Station Square. Sonic, Knuckles and Miles "Tails" Prower later meet Chaos 2 by the pool of water in the Mystic Ruins just before it becomes Chaos 4.

Appearance
It is taller and more muscular. The bones that were in Chaos 1's right arm now run along both of Chaos 2's arms and now both hands have Emeralds. Its head has moved forward, giving it a more unpleasant appearance, the horns on his head have also changed position to give it a hammerhead style look.

Powers and abilities
Because of the two Chaos Emeralds empowering him, Chaos' hydrokinesis is enhanced to the point that he can produce water over a huge area. His strength is also increased, giving him more powerful punches and extendable limbs (though stretching renders him vulnerable). For defense, Chaos 2 can generate an energy shield that cannot be bypassed. He can also shapeshift to assume forms like a giant ball.

Battle
To start the boss battle with Chaos 2 using Knuckles the Echidna, the player has to enter the Hotel Restaurant in Station Square.

Boss guide
In battle, Chaos cannot be attacked, until he begins to first. As attacking, cause him to use his energy shield. When he attacks, aim for a punch at him, rendering him to his water form until he return back. If he takes as a sphere form, jump at it, to make him leave this form to attack. After dealing three damages, he will consume the arena with water, glide to bypass this type of harmful water, until he returns back. And when he attacks once again, finish him.

Sonic X
Chaos 2 first appeared in "Pure Chaos" in Sonic X. After Dr. Eggman showed up, he took Cream's Chaos Emerald and fed it to Chaos 0, transforming it into Chaos 1. Almost immediately after, he gave another Chaos Emerald to Chaos 1, transforming tried into Chaos 2. Sonic and Knuckles, having arrived at the scene, tried their hardest to fight Chaos 2, and with luck, they managed to defeat it. Afterwards, Eggman sucked up Chaos 2 into his Egg Mobile and flied away.

Trivia

 * Though Tikal said that his brain must attacked to deal damage, Chaos 2 is vulnerable in any spot, unlike Chaos 0.