To my fellow Ness players I've come for advice.
I'm potentially maining Ness (dropping G&W) and have read PK Cross about 5 times as well as various other Ness guides listed in his "useful links" thread. My questions are...
First off, I don't think you should drop Mr. Game & Watch. He's a good character that can get pretty far. If you're going to use Ness, at least still have Mr. Game & Watch as a secondary. You know, for those hard match ups.
Should Ness' aerials be fastfalled consistently?
Your fast falling doesn't have to be used consistently, but it probably makes things safer.
What are the most useful advanced techniques to master with Ness?
Ness has a lot of AT's, but some aren't necessary. For example, Firebound is used for offense and defense at the same time. It's an awesome technique and it also looks flashy. But it's really not necessary to use. I assure you it's a lot safer than PK Jump.
That's another thing. PK Jump is useful, but it can put you in a bad predicament. Reversing it would probably be the safest way to go with it. However, if you can manage to land it unpredictably, then you'll find it much more useful that way. Either way, it's good to use, but not as safe as Firebound.
You can also pivot your PK Fire for better spacing on the ground. But that's not all Ness has. Each character has a universal technique called the Hyphen Smash. With Tap Jump on, you can do a Reverse Hyphen Smash. Just skim through the guide and see what interests you the most.
What are Ness' best options to avoid being shield grabbed?
Retreating your aerials would be the best options. If you just dive right in, you'll most likely get grabbed or OoS by your opponent.
What are your thoughts on controller configuration?
Mine are set to default. Others have theirs set to default as well. For Firebounding or Auto-RAR, they have their C-stick set from "Smash" to "Special". For RAR (Reverse Aerial Rush), which is another universal technique, you can do it with or without the C-stick being changed. I prefer without the B-stick method. Some Ness mains have their Tap Jump set to off while very few have theirs totally different.
Has ledgebending been figured out, or is it still situational?
Ledgebending is still situational as far as I know. I was told there was a way of doing it consistently by a member from YouTube who viewed my ledgebending on Final Destination. I never got around to testing it, though.