Is Knuckles a foe of Sonic

Knuckles and Sonic didn't exactly get off on the right foot when they met. Knuckles' goal in life is to protect the master emerald on Angel Island, and he thought Sonic was there to steal it, so when he saw Sonic there he set a trap to make things difficult.

Since then however, Knuckles and Sonic have become friends and have helped each other with mutual objectives.waka taka teeee