Super Sonic (スーパーソニック Sūpā Sonikku) is a super transformation and powered up version of Sonic the Hedgehog that can be activated after obtaining a Smash Ball. This power appears in Super Smash Bros. Brawl as Sonic's Final Smash.
When Sonic transforms, he gains the ability to fly around the stage at an incredible speed. The transformation lasts for about 15 seconds (though this can be extended by ramming into opponents and other things that can take damage, causing him to freeze for a moment), and, while Sonic is transformed, he is completely invincible. He is also unaffected by Bumpers. Sonic can attack in this form by simply ramming into opponents; the faster it's going, the more damage is dealt. When the opponent is attacked, the move deals about 35% but the first attack is roughly 25%, and never lower. It is similar in function to Pikachu's Final Smash, Volt Tackle, except that it cannot go through hard platforms like Volt Tackle can (however, when Sonic is too slow or has stopped moving, he will be unable to go through soft platforms), and has better knockback and control. Super Sonic can't KO himself when he reaches the blast line, regardless of how far it is going, but if he turns back to normal while he's too far away to recover, he'll be penalized with a self-destruct. Sonic's Final Smash is arguably among the strongest in the game, as the player cannot die or take damage for the entire duration of the transformation (even Wario-Man and Giga Bowser can accidentally self-destruct and are not nearly as fast or powerful). Furthermore, an experienced player who has learned how to control Super Sonic's unwieldy movement can use and abuse his relatively high damage output and insane speed to guarantee multiple KOs.
Sonic's English voice clip (voiced by Jason Griffith) upon activating the Final Smash has been constantly argued by Brawl players as to whether he says "Now I'll show you!" or "Here I'll show you!" By going to the in-game sound test and listening to Sonic's voice clips, one can confirm that he indeed says "Here".  The audio clip pronounces an 'r' sound after the vowel, which is an 'e', while the beginning sound, which is echoed, sounds like an 'h'. However, opponents argue that the echo is so disruptive that the word "Now" is corrupted into sounding like "Here" in order to be in accordance to DOJO!!'s description, while an alternative argument states that players are "hearing what they want to hear"; some are conditioned to recognize "here", while others are conditioned to recognize "Now". Officially, while Sonic says "Here I'll show you!" in-game, sources like DOJO!! describe the Final Smash with the quote "Now I'll show you!", and therefore the quote is documented alongside the Final Smash itself.
 Trophy Description
Sonic's Final Smash. The Chaos Emeralds give energy to all living things, and Sonic's gathered all seven of them, then used their power to transform into Super Sonic. His abilities in this form far surpass his normal ones, and he is even able to fly. He uses a lot of energy in this form, so he can only remain in it for a short time.
In the Final Smash, the Chaos Emeralds can be seen briefly before Sonic turns into Super Sonic, and once he transforms back into Sonic. In the latter instance, the Chaos Emeralds fly off the screen in 3-D.
In the games, Sonic had to collect all 7 (6 in the first game, therefore he could not transform) Chaos Emeralds in order for him to turn into Super Sonic. In the older games, the Chaos Emeralds were hidden in Special Stages and were treated as the easter egg/unlockable feature in the games (starting with Sonic the Hedgehog 3, other characters were capable of attaining Super forms such as Knuckles). Whilst in Super form, Sonic will act under the influence of the Invincibility and Speed-Up items and gains the ability to fly, drastically increasing his speed and can destroy enemies merely by touch. However, because of his immense speed, the player could easily fall victim to pitfalls, the one thing he is still weak against. In addition, the Super form does not last for long as it consumes the player's Rings constantly, and thus must continue to grab Rings to maintain the state. Beginning with Sonic Adventure (excluding Sonic Shuffle) and up to Sonic Unleashed, Super Sonic is only available for play in the final boss battles which required him to defeat a similarly-powered up major antagonist. Sonic Colors and Sonic Generations, however, have since allowed Super Sonic to be usable in the games levels as before, with it being the sole availability in Sonic Colors, and unable to be used on any bosses, excluding the Final Boss of Sonic Generations.