As for OS, make him approach u. Get the lead and keep it. I know u feel compelled to not play gay, but all ROB is going to do is sit near the ledge and camp. Just get in a quick combo and start air camping, not getting hit by any of his projectiles, and he'll eventually get back on stage. Just make sure hes the one approaching and ull do fine.
Greatness has the right of it. Goose would probably get 3 stocked by a good ROB.
It's unfortunate that you normally play vs. me Count, as most ROBs would say "oh, he powershielded 17 lasers, I'll get back on the stage now" while I will continue to fire lasers and time you out.
The reason I was able to beat you without feeling much pressure is you would get the standard Diddy combos and huge-*** ROB and have tons of damage while I'm hoping to get a lucky gimp (cuz that's how ROB rolls).
The Diddy / ROB matchup goes like this:
Step 1. ROB gimps Diddy and gets a stock lead and/or Diddy deals 40-80% from a combo or two because ROB is huge and has blind spots
Step 2a. ROB camps, and Diddy loses his large lead through a ton of chip damage by not shielding projectiles properly.
Step 2b. (optional) Diddy approaches ROB near the ledge to attempt to get it off, then gets wrecked because that's what ROB wants.
Step 2c. (optional) Diddy shoot peanuts out of desperation. ROB uses this opportunity to hit you with a fully charged gyro, dealing 20% to you, or he air dodge and catches a peanut. He is now able to glide toss to approach you, potentially wrecking your life.
Step 2d. (optional) Diddy throws bananas out of desperation. ROB uses this opportunity to hit you with a fully charged gyro, dealing 20% to you, or he air dodge and catches a nanner. He is now able to glide toss to approach you, potentially wrecking your life in addition to having one of your bananas. Generally, ROB just keeps the banana and continues to spam all day.
Step 3. ????
Step 4. PROFIT
No Diddy I've seen knows what Step 3 is. They've all just done variations of steps 2a-2d, and it generally doesn't end well. The ROB doesn't even have to think, just mix it up now and then and the Diddy has a reeeeeeally hard time doing anything.
When I first played AZ and he started getting around my gimp traps, I'd start camping at 0%. THAT is a long game; we went to time a lot. That's not good for Diddy, because ROB has more reliable kill options from any point in the stage and if you get too aggressive you get gimped.
Pressure Diddy has never worked against ROB. It looks like it does because ROB is a huge target and is easy to combo at lower %, but it always ends with a ROB fairing a few times then bairing you out of your up+b and you think he just got lucky.
Diddy vs. ROB is a crappy matchup for Diddy.
I've been playing Diddy for a while, and honestly my advice to anyone playing this matchup is to simply play with one banana or get in the habit of throwing an extra banana off stage so ROB can't get it. You're a lot more mobile this way and able to keep up a pressure game without the game sweeping out of your favor. Many a match vs. a Diddy has my ROB suddenly gained control of one banana, thrown a gyro, then has two bananas and a gyro on the stage and gets to go to town on Diddy.
Don't try to punish Rob's Fsmash, Ftilt, Dtilt, Bair, or grab nanerless, Dsmash yes(shieldgrab).
You can punish f-tilt OoS if it is powershielded. ROB's f-tilt is commonly powershielded because the opening frames last just long enough to allow you to shield on reaction, and a lot of people just naturally powershield it. If you do, dash attack.