basically here is the ordeal....the marth double fairs while retreating and nairs while approaching...if any of them hit me i get grabbed and zero to death easy or at last 50% put on me.....i cant seem to get in to grab without gettin hit and they dont mess up l cancels......i cant through marths range....i do lazer but once he gets nair i cant seem to outspace his massive hit box.....
if they're retreating with double fairs, don't pursue. Laser instead. What do you lose by him whiffing double fairs? You
gain if you laser him. And chances are he's doing this out of fear/whim because it's an unsafe way to retreat...you could beat it with well timed shffl nairs or even a shine approach. Punish his idle decisions.
If he's approaching with nair, you can jump over it and bair really easily. you can waveland on a platform at an angle which the nair doesn't cover, and drop with nair/bair/dair to punish it.
you could also shield the nair and grab oos, usmash oos, shine oos, or wd oos away from him if he landed behind you and retreat for space with a SHL
many times you can buffer spotdodge in between his aerials and an ensuing grab at low percents.
dealing with marth's range is really difficult. you have to deal with the possibility of whiffed aerials to dash away, to jc grab on your short approach/failed punish, the possibility of whiffed aerials being covered by utilt, and also long grab range, not to mention any ftilts/fsmashes are being thrown out. my best advice for beating marth's range is don't try--pick your battles, keep him in the air with lasers so you can take away his aerial game with nairs tearing through anything he approaches with or shield and punishing, if applicable, leaving him with dd to grab or approaching dtilt. this is your chance to approach past him, barrage him with more lasers, or even grab approach him
to deal with his combos, don't use your jump unless you know it will be safe to do so. DI away anything but fsmash, utilts, and chainthrow at exactly 20% post throw(you can shine out if they try to regrab without moving at this percent)