Well, I used to have superstitions for catching Pokemon. In the Hoenn games, I rapidly tapped A, in the Gen I remakes I pressed the d pad in the opposite direction the Pokeball would turn to, in the Sinnoh games I'd do the same, but in HG/SS I didn't use anything. In all the previous games, the tricks I used made catching healthy Pokemon easier, but I didn't use it in HG/SS and it made catching them much harder without weakening them first (IE I could use an Ultra Ball on a healthy lvl 3 Ledyba and it wouldn't catch it!).
EDIT FOR enemytracker: Actually, you can get more exp by holding L... that is, if you have an action replay.