Didn't I go over this before?
Snake:
Jab, Ftilt, and Dtilt out range and out prioritize anything you can do on the ground. Utilt will beat out any aerial you try to jump in with. And if he constantly has a nade on hand it'll prevent any CG attempt.
MK:
Hard to grab because of his speed, mobility, and generally safe moves. Pressure game is really good at separating the IC's which include repeated Ftilts and Dtilts, lagless aerials, tornando, and drill. His edge guarding also gimps the IC's recovery.
Falco:
Lasers and shine completely wrecks your approach. Lasers can out spam ice block, stop squall hammers, go through blizzards, and disrupt desynchs. Although you can do desynched ice blocks to contend with his lasers, he can just counter with his shine.
GW:
Dtilt beats out all of your attacks, and his long lasting hit boxes will punish any roll or spot dodge. Bair is the only move in the game that will consistently shield poke both IC's, and Uair will really screw up your landing.
Marth:
Out ranges and out prioritizes you in both the ground and air. That along with his good aerial mobility makes him very hard to grab.
R.O.B.:
Spot dodge into Dsmash easily separates the IC's. Lasers will go through all of your attacks, and his edge guarding easily gimps your recovery.
TL:
He will definitely out camp you with arrows, boomerangs, bombs, and Zair. If he makes sure to always have a bomb on hand then it'll prevent any CG's. He completely out classes you in the air but you can contend with him on the ground.
Pika:
Just like R.O.B. spot dodge into Dsmash will work wonders at separating the IC's. Randomly calling out thunder is actually a good strategy since it'll prevent CG's.
Pit:
Similar to Falco his arrows will go over ice blocks, stop squall hammers, go through blizzards, and disrupt desynchs. So he can really wreck your approach, and he has two reflectors in case that doesn't work.
Diddy:
This is only hard cause of banana's, so if the Diddy player knows how to use them well then it'll be difficult, but if you can take control of them then it'll be a lot easier.
ZSS, Zelda, and Lucario:
I don't know why, but a lot of players view these as hard match-ups, so far I've never really had trouble with them to much.
Obviously these aren't all counter match-ups but you are at a bit of a disadvantage in each one. And I'm not sure why you're having trouble vs. Olimar.
