Bolt Attack
From Sonic Retro
The Bolt Attack is an attack Super Sonic performs against Perfect Chaos in Sonic Adventure.
The attack happens when Super Sonic reaches maximum speed. A blue aura appears around Super Sonic and he moves very fast, becoming very uncontrollable. He needs to use this attack on Perfect Chaos six times to completely destroy him.
Trivia
It could be said that Super Sonic's dash attack used in later games evolved from the Bolt Attack. Instead of having to go a set speed, a button activates a short attack blast which causes a similar effect as the Bolt Attack.