I only use the counterpick mentality because it works(at least for me). I know its frowned upon, but its more interesting for me and plays well to my strengths. I actually play up to 5 different characters in tournament, Bowser is cool but he just has some pretty uphill battles. There are players in my area that I can only beat with one of my 5. Not necessarily because its a bad matchup, but because my playstyle with that character beats their playstyle.
Ness does have a bad DD game, but it is pretty decent vs Ganon and bowser who have ****ty grounded movement. And he I said he uses PK fire, I did not say he spammed it. Spammed PK fire is pretty easy to beat, but he uses it pretty intelligently. I definitely understand spacing (ivy without spacing kinda sucks), but my SDI is pretty terrible...
But really I was just looking for good neutral options that ivy can use vs ness's and Ike's options and ways to DI or get out of his combos as ivy.. I appreciate the SDI comment, I need to work on improving that.