As far as I can tell, use S ball and 2P to hit it for Zappa considering he can run under K and P balls. Can run under Stinger Aim, from the vids I've seen a lot of people like hitting a K ball with a j.HS as a defensive maneuver.
Naked: 5S and 2S are good pokes, just watch out for centipedes. 6P and 6HS are pretty good AA's against Zappa naked.
Sword: This is the hardest summon for me still, 5S or Stinger Aim during his downtime seem to be the best during lags between attacks.
Dog: Try to 2S it away, if the Zappa likes to send in the dog, I would just set up balls...but good Zappas usually walk their dog.
Ghosts: Most Zappas I've seen try to jump then start firing the ghosts, hitting P ball with 2HS can take care of this, or an S CR. If not just try to dodge the ghosts while summoning your own balls to outzone him.
Raou: Dark Angel during Raou then setting up balls can save your ass.
Anyone else? The spit gives me a lot of problems still.