In "Paw Patrol," there are various episodes where Ryder and the pups engage in fun activities like playing frisbee. If Rubble is not with them, it could simply be because he is busy with something else at the Lookout or involved in a different mission. The show often focuses on teamwork, but there are moments where certain pups are featured more prominently while others may have side tasks or are not immediately involved in the current activity.
If you have a specific episode or scenario in mind, I can help clarify further!