There are various reasons why Knuckles and Sonic fight. Sometimes Dr. Robotnik, AKA "Eggman", tricks Knuckles into believing that he has turned good and that Sonic is in fact, the bad guy. When Knuckles first made his debut in Sonic the Hedgehog 3, Dr. Robotnik tricked Knuckles into thinking that Sonic came to the island to steal the emeralds. Near the end of the game, Dr. Robotnik turns on knuckles by stealing the emeralds for his new weapon which Sonic and Knuckles teamed up to destroy. Since then, Knuckles has been a valuable ally for Sonic, when the two don't disagree.
Another reason Knuckles and Sonic fight is because of their personality differences. Sonic is cocky, arrogant, and free spirited; Knuckles is stern, hotheaded, and quick to anger. Sonic frequently catches Knuckles at the worst times like when Knuckles is being flirted with, with that in mind Sonic taunts Knuckles on for days like an immature child. This also eggs on fights.
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noYes Knuckles is stronger than Sonic, he is the strongest Sonic character in the series.It's never been definitively proven, really. I'd assume Sonic would win in a fight though.
You can only get Knuckles in Sonic 2 if you stack Sonic 2 and Sonic and Knuckles on the Genesis. Otherwise Knuckles cannot be played in the game.
this is easy sonic is really stronger then knuckles sonic using chaos contorl and finel color blaster sonic is very stronger then knuckles
You can play Sonic 3, or Sonic & Knuckles but unfortunately you cant play Sonic 3 & Knuckles on Sonic's Ultimate Genesis Collection.