First off, I'd like to say that's an amazing chart you've got on the first page. Really creative!
Ness
Anyway, this match up is pretty close. Versus Bowser, PK Thunder can do some justice. It's best not to do it while he's near you or if you're out in the open for I believe his Bowser Bomb? Is that the right term when he comes down in a sitting position? Anyway, it's best to attack him with PK Thunder if you're under a platform while he's in the air or if he's off the stage. But enough about PK Thunder.
PK Fire isn't Bowser's best friend, we all know that. If hit, Bowser is somewhat screwed as this gives Ness many options, some better than others. Of course Bowser can still escape PK Fire, I'm sure. However, getting hit over head can really mess things up for Bowser. You can even perform pillar spikes on Bowser when he recovers. That of course depends on where he's recovering. Still, it's possible, but also situational in some areas.
As for Ness' aerial attacks, Bowser is large target, so a lot of Ness' aerials are quite effective against Bowser. Is there reallly a reason for me to explain? Ness can retreat some of his aerials, so avoiding grabs is somewhat easy.
Bowser
Bowser has a lot of power and he's pretty heavy, so this is what in my opinion makes him a difficult fight. For starters, his grab release isn't good for us. Often times a Bowser main will use his or her grab release when the time is right. That time would be when Ness is weak enough to die by a d-tilt, which is outrageous, but expected for this giant beast. Bowser likes to use his infinite double jumps and it works sometimes.
It's kind of like Peach's floating, so it leaves Bowser open. But his aerials are pretty brutal, so that's something to look out for. Especially that body slam when he grabs and does a flip that defies gravity. And let's not forget his uair. Bowser's uair is slow, but it's sexy, too. It can kill early on.
Bowser can also gimp Ness' recovery. But not too often, which should be the least our worries. It's possible and it works since that fiery breath can stop our second jump, but nothing too major to go in to. If Ness is at stage level or above it, he's basically safe from Bowser's gimping. Okay, so Bowser apparently is all about strength. His attacks kill us pretty early. Even his tilts. We've got the ability to deal with Bowser and he's got the ability to deal with Ness.
My Conclusion
From my experience, which was a bad one,
I'd often times lose to Bowser. This could possibly be because I lacked and possibly still do lack the match up experience when I go up against a good Bowser. However, I did not deal with crappy Bowser's. I fought two good ones. Personally I'd like to say this is 50:50 or 55:45, Bowser.
