Teleport helps!
You can bring an Abra with you for a cheap alternative or you can sketch a teleport on a Smeargle. Helps you get back to P.C the fastest way and run back to wherever you are farming. Some might say Fly is an alternative but when Fly puts you right infront of the P.C building, Teleport directly ports you infront of the nurse. That means you don't have to take 5 steps in and suffer 3-5 seconds from the pokemon center loading time. These little things add up at the end and helps you make more encounter rather than wasting time!