ROBs lasers are easy to see coming, and are not spammable.
They should not be an issue.
The spinning top is a bigger problem, because it eats aura spheres and sits around for a while.
The BEST way to cripple a ROB's offense is by picking up the spinning top, and then dodging him and spamming Aura Spheres. The only range he has at that point is his laser, which won't even kill you over 150% if you DI properly or have good dodge timing.
ROB's aerials, especially his NAir, need to be coaxed out and dodged before you attempt any aerial move against him. ROB's aerial priority is REALLY high, and the hit boxes are HUGE. Just jump at him in the air, air Dodge what is most likely his NAir, and then pummel with DAirs or whatever you prefer. The laser can only be used like, once every 10 or 15 seconds, and are usually only used when you're at a distance, charging your aura sphere. When he finally gets his top back, he'll be guarding it like crazy, so you can DAir him after faking him out by looking like you're going for it, and then get it once he flys away.
So yea, there you go. As long as the ROB player isn't some sort of ROB Genius, the match should be pretty much in your favor.
Also- As for Lucario's Fabled DAir Meteor- It exists! It can only be done to people hanging from the ledge, which is pretty much the maximum usefulness that the DAir can provide in that case.
I'll start working on it[The Guide 2.0] tonight!
-DD