You know how Scourge is an evil version of Sonic? Well, does any1 know if there's ever been an evil Knuckles?

actually there is but idk it every1 has an anti version of them

Technically, there's an anti-Knuckles. He hates violence and Knuckles. He looks just like Knuckles, but with a moustache and beret. He's not necessarily evil, but he's the opposite of Knuckles. Hope this has helped.