Which Pokemon do you like capturing best? I know each Pokemon has some moves to prevent you from capturing them and some of them may annoy you to hell. But there are some Pokemon just stand there for you to circle and earn a handful of points.
My favorite is Camerupt. I capture and release it many times for roughly 500 points each success S Rank capture. It only walks around slowly for so long a time between its 2 waves of attacks that I am able to whoop it neatly and easily.