For what it's worth, you all
need to ban Norfair. Bowser somehow gets magnitudes worse to handle in that fiery deathtrap.
Bowser is a lot tougher to handle than you think, it seems. His defense is amazing to the point where Ness
cannot go on the offensive at any point in this match. Out of shield Whirling Fortress isn't fun to deal with, and his grab-release on Ness can't be easily dismissed. His shield is accordingly massive, so good luck poking at it.
You do have more range with your projectiles (PK Fire, PK Thunder, and even PK Flash if you're gutsy enough), no doubt about that, but Whirling Fortress will easily break most of the attacks Ness throws his way.
Yes...because Ness is just going to slam himself into you when you have a full shield out with PKT2 huh?
When Bowser has enough time to throw his shield up, yes. You have two options with PK Thunder, assuming a competent Bowser:
1. Aim at Bowser and hit his shield, a zero-sum operation. Unless his shield is severely depleted, it will not do much of anything to old Gojira.
2.
Don't aim at Bowser, which will let him go to town with Ness. When you factor in that Ness isn't very heavy to start with (tied for 20th in weight), one shot from Bowser will hurt badly and may even give him enough time for the forward smash.
Try to grab a shielding Bowser, and the invincibility frames of Whirling Fortress will make you think otherwise.
I would say that the match-up is anywhere from 55-45 to 45-55, and I'm leaning towards the latter. I made it seem grim for Ness, but you do have a lot of options. Bowser is, of course, easy to beat on, but he'll live to obscene percentages even if you land your killing blows. He has more margin for error...you do not.