If the follower can't interact with wild pokes, you get free repels for every person who is following. person A uses repel, Persons B, C, D ect... dont need to because they cant interact with wild pokes.
If the follower can interact with wild pokes, Person A uses repel, Persons B C D ect... dont need to input any presses for farming the same area.
Also abusable for digs runs + multiboxing, 1 input 4 outputs from the same person without macro required