Skipper and Julien have an strange relationship, sometimes acting more as enemies than friends. They are rivals and frenemies, so to speak. Though they often clash with one another, they each consider each other friends.
Most of the time they are rivals of one another but there are times where they help each other out (for example, Julien saved Skipper's behind from Joey the Kangaroo. and in an instance for Skipper, he turned Julien back into his old self.
Julien tries being nice to Skipper, who he considers one of the few people he has never treated with kindness.
Skipper got annoyed with Julien's "nice guy" routine and wanted him back to normal to one, stop bothering him and because Skipper's more used to his self-absorbed version.
He got annoyed when Julien pretended to be his pillow.
After learning from Maurice that Phil and Mason tricked Julien, Skipper tries to break Julien out of the silliness of the sky spirits. However, Julien ends up ignoring him.
Skipper helps Julien get back to his old self by tricking Julien into thinking the rainbow at the end of the episode was the sign Skipper was talking about. It causes Julien to become his self absorbed self.
Skipper actually lsmiles proudly when the mission is accomplished turning Julien back to normal as the lemurs torment Phil and Mason, who had convinced Julien he had to play "nice guy."
It is proven in this episode that Skipper does indeed cherish his friendship with Julien as he cries over the fact that they had touching moments he and Julien shared together. The tears released Julien.