I'll go as far as to say this is in the top 5 worst MUs in the game, which I could just as well suffice if I said it's Ganon's top 5 worst lol.
Three things about Falco cripples us--not just bad, since he has a lot of extra "bad" things on us, but three things that absolutely cripple us. They are:
-His phantasm. It has to be read perfectly for anything to be done about it. Falco's phantasm lets him get away with from murder. We have no answer to his phantasm beyond our ingenuity as players to circumvent and read. It goes too far too quickly.
-His lasers. The worst thing about the MU, which I'm sure everyone already knew. The only thing Ganon has that can deal with Falco's approaches or punishes for our approaches are jab, and even that's pretty unreliable. We take 70% of our damage in this MU from lasers, and the lasers just come out too quickly and without any real frontal zoning options since the lasers preclude RARs, we're solely reliant on a solid read, with, usually, very little payoff.
-His jab. Not much needs explaining here. His jab clashes with or outranges most of what we can throw out. Even if it didn't, it outframes everything we've got by a nautical mile.
So, as we can see, Falco covers every option Ganon has due to both speed issues and poor zoning options from the anterior. He's got us at long range, medium range and close range. As so many before me have stated, our only hope in this MU is to be the undoubtedly superior player by no less than three-fold.
The good things we have (if you can call them good in the face of the cons aforementioned) are the fact that Falco's recovery is pretty easy to cut off as Ganon (it's how I get my kills on Falco at least) and that Falco really can't kill us easily with the exception of a CG, which really shouldn't kill us to begin with unless the Falco is smart and reads the Ganon's recovery mix-ups. At high percents, Falco has a really tough time sealing the deal if the Ganon keeps his shield up. Though, Ganon doesn't have a much easier time killing for the most part, primarily because we only have a handful of moves that meet the stringent zoning demands of this MU, so our DAirs and such will be staler than Falco's bread.
So, abridged:
Good for Falco:
-Has the CG and a fairly reliable kill off of it (yes, even with DI!)
-Lasers to kill approaches
-Phantasms to relieve any kind of pressure
-Jab to put some room between him and Ganon at close range.
Good for Ganon:
-We can gimp you guys pretty well
-We're hard to kill
It's 90:10 in my opinion. If the Falco is top-tier, there's no reason Ganon should even have time to cut a fart, let alone the space or wherewithall.