* Early Games: Initially, Shadow and Knuckles were antagonists. In Sonic Adventure 2, they were on opposing sides, with Shadow working for the evil Dr. Eggman and Knuckles protecting the Master Emerald.
* Sonic Heroes: In this game, Shadow and Knuckles are teammates in the "Team Dark" group, alongside Rouge the Bat. This marked a shift towards a more collaborative relationship.
* Later Games: While they don't always get along, Shadow and Knuckles have displayed moments of respect and even cooperation. They often find themselves on the same side against a common enemy.
* Sonic Frontiers: In this game, Shadow and Knuckles share some lighthearted interactions, showcasing a degree of camaraderie.
Overall, their relationship is more of a "frenemy" dynamic. They respect each other's skills and abilities, but their personalities and approaches to situations often clash. They can be allies when necessary, but their fierce independence and competitive spirit prevent them from forming a true, deep friendship.