Shadow and Knuckles

The Ultimate Life Form and the Master Emerald's Guardian(?).

I never thought that it'd be so simple but
I found a way
I found a way

If you open up your mind (see what's inside)

It's gonna take some time to realize
But if you look inside, I'm sure you'll find

Over your shoulder you know that I told you
I'll always be pickin' you up when you're down

So just turn aroooooound.