In the universe of Sonic, Chaos Control is a power in which one can warp time and space with the mystical Chaos Emeralds, and first utilized by Shadow the Hedgehog during the events of Sonic Adventure 2. Chaos Control is also considered to be related to other general effects brought about through use of the Chaos Emeralds.
Although Shadow the Hedgehog is the first to be seen using Chaos Control in Sonic Adventure 2, the earliest known user is Black Doom, the Black ARMs leader, as he could very well be over 2000 years old (as he states before the "Sky Troops" stage in Shadow the Hedgehog that he visited Earth around that time years ago).
He used Chaos Control along with Super Shadow to return the ARK to it's proper orbit before it crashed into the Earth.
When Team Dark uses their Team Blast "Chaos Inferno", Shadow uses Chaos Control so that after the Team Blast, any and all doors, gimmicks, and enemies will be frozen for about 15 seconds.
Super Smash Bros. BrawlEdit
In this game Shadow can be summoned via. trophy and uses Chaos Control to slow down the other brawlers. This trophy is unlocked after you unlock Sonic as a brawler.