Okay...what the hell is Ness supposed to do against a spammy Dr. Mario?
I would probably just bat them away until he approaches.
I think Dr. Mario is actually one of Ness's harder matchups. I've tried batting away Dr. Mario's pills. The reflected pills never arc back down like normal, so batting is pretty useless. You seemed to do okay for the most part though. Maybe approaching by running and powershielding pills could work.
*sigh* Okay. Is this player really good, or do I just really suck? I just recently fought this Japanese player and got completely annihilated.
He was pretty good, but he's not unbeatable.
Against Robin, you want to try to harass him out of charging Thunder ASAP, but I wouldn't do it with PK Thunder unless he is in the air, because it is easily shielded.
Approaching him by running and power shielding could work, or by air, but just watch out for Elfire or Arcthunder. If you get hit by either, try to roll out or DI out of it ASAP.
If you ever get a PSI Magnet absorb off, you can roll directly out of it as soon as you absorb, so keep that in mind.
You're right that Ness is good against Little Mac.
Try to throw him in the air or off the edge, then juggle him with PK Thunder. Basically any time he is in the air, it is very safe to follow up with a PK Thunder.
The biggest mistake I saw you doing against Little Mac was trying to follow him offstage instead of simply PK Thunder gimping him.
If you hit Little Mac with the tail of PK Thunder right after he Side Bs or Up Bs, he will be knocked out of it for a bit and it makes it very difficult for him to recover. Also, if he ever uses counter while recovering, you can hit the side of him opposite of the stage and make him move further away, lol.