Sparky

The Robotnik Lineage has supernatural physicality and intellect at the price of either mental stability or physical health. It's a blessing and a curse.

Blaze was originally from the future of Sonic's World and the Sol Dimension as we know it did not exist until Sonic 06's ending. Blaze sealing herself in a different dimension, followed by the defeat of Solaris and the Flame of Hope being blown out leading to the rewrite of the timeline, is what created the Sol Dimension as all of the essence of Solaris that was purged from Sonic's World followed Blaze.

The events of Sonic '06 cracked the space-time continuum. The events of Sonic Generations shattered it completely, and resulted in the separation of Classic Sonic and Modern Sonic, and the separation of Sonic's World and the Human World. As a result, history and each characters' memories is a mess, hence why certain characters behave differently from how they should, like Shadow for instance.

The Sonic that existed from Sonic 1 up to Sonic Adventure 2, or Sonic 06 or Black Knight at most, is the best Sonic.

What other information on the Battle Kukku is there?

Sonic Wind. He conjures a blue whirlwind without spinning in a circle. He just says "SONIC WIND", and it appears around his opponent instantaneously.

He does have a point, though. When a Flash goes "too fast", they are in danger of being sucked into the Speed Force. Permanently.

I am both a Sonic fan and a Flash fan, and having accumulated a ton of information regarding their speed and how it works, I can say with the absolute certainty that Sonic the Hedgehog and The Flash are the EXACT. SAME. SPEED. From every piece of evidence I've seen for Sonic in the games, his speed works just like the Speed Force without all the lightning stuff. Sonic can not only reach and surpass lightspeed, but he can also manipulate movement/kinetic energy/speed in anything he touches, and he can manipulate the flow of time, and his speed can even get time moving again. In Sonic Battle, he vibrates his molecules. From these and other stuff, it's safe to say that Sonic is on the same level as the Flash. But, the Sonic Franchise isn't as "in your face" with it as the Flash franchise. The true nature of Sonic is rarely ever touched upon clearly, while the Speed Force is extremely well defined despite being a mysterious force. As a result, these specific debates always end up once sided because everyone knows the Flash's speed but they don't know Sonic's, and it's even true among Sonic fans. Everyone is more likely to think that Sonic only has strong legs and can barely break the sound barrier, and without the Chaos Emeralds he's done for.

Eggman used Chaos Control to split the world into 7 different dimensions or something.

Sonic teleports in SA2, several times when you fight him as Shadow. Shadow is the same speed as Sonic, canonically. There is no difference in abilities other than how they use it. The descriptions don't lie. If you think they lie, then your just stuck in your own headcanons and can't accept when the actual canon proves it wrong.

Shadow the Hedgehog was created, as a character, to be a dark version of Sonic. He was always intended to be a character that looks like Sonic and has Sonic's abilities. I will never understand why many people aren't aware of this fact.

Sonic isn't any fatter, that's an optical illusion as a result of Shadow's black color. They are officially identical, it's said in most of Shadow's profiles. Shadow is a dark version of Sonic, and so he is identical to Sonic in appearance and abilities.

Shadow is identical to Sonic. He is not slower but stronger, because he is not Knuckles.

Poor Sticks...