O_O...Dark Super Sonic looks...scary. I'm still not sure how he achieves such a form. I mean, I know that strong negative emotions like anger and hate can cause such a transformation, but what else is involved...hmm...research this I must. XD
Yes it is. In an episode of Sonic X, Sonic gets angry at a villain (if I remember correctly)who threatens to kill all of Sonics friends including Robotnik. Sonic transforms into Dark Sonic and destroys some of the villains minions but is calmed down by Robotnik. Apparently, after seeing this episode, Sonic only transforms into Dark Sonic when he has all of the Chaos Emeralds and gets angry.