Gah!!!! Its so early in the morning and I have not slept yet. Im gonna after this post so Lets see if I can give good advice while im half asleep/
Camp Him. If he wants to be cheap, you be cheap as well. When he is not near you Pick up turnips and throw them at him over and over. spam the turnips. Doing this does many things.......
- Makes it very hard for marth to attack you
- You slow him down and cant spam his move much.
-create a wall of turnips in from of you that Marth needs to get through in order to hit you, but by the time he does that, you should areadly have something planned for marth as a counter attack, or just grab him Aslo with in the wall. instead of picking up one from the ground, Z-grab the ones in the air( the wall) and trow it at him for fast turnip throwing. Dont pick one up when he is near you. Smart and fast players will punish you for it.
Now for his happy spaming azz. While he does that, dont rush into him. If I know these power hungry marth, they will only foward air you twice, once his second one comes in, Dash attack him (grab can work too if fast enough)When Marth Full jumps, I bet he F-airs twice right? when he does the first one, done rush at him, cause another on is gonna come in after that comes in and close enough, Dash attack him.then if you need room, camp him (spam turnips at him) If Your friend cries or complains about this, Dont stop cause of that. Marth can be real cheap with Peach and I think Peach gets it the worst from Marth than other characters in this game. So if he wants to be gay about it, you do the same. Camp him and rack up damage. Peach can be a tank. Just sit in place and rack up damage. Then once you think you can knock him out go for it.
You can shield grab Marth If he dash attacks you or F-airs you up close, you can grab him out the shield, if he is not that close when the attack his your shield dont even bother. Roll away or run to get space and camp him if possible at that moment.
As for coming back on the stage, If you know you dont have a jump, Up -B early and Glide to the stage, but beware, now Marth gets power hungry and he will go crazy with his Up-air and maybe F/Bair. Try to syke him out for safe landing. Mindgames comes into play here cause once you up-B, thats it, your oh so very open to an attack and nothing you can do about it.
Also if you know marth is gonna Fsmash you and you did not U-B yet, toad him............but at your own risk. and dont make it to obvious. he will catch on then wait till you toad him then knock you out.
Not much you can do if you get Dtilted but Up-B your azz off and try to smash DI it.If close to the edge, when he Dtilts you, tech it. it raises you up and you can go even higher. but you have to be close enough to the edge and time the tech right.
I believe that is all the advice I have for your lil problem. Any more question about Marth, i'll be happy to help. I dont like this match up at all, So I read and learn every lil thing I can do to end is azz.And how to be cheap on him as well as he does to Peach. and camping is one good way to start. and its very affective if you can camp very well. Just dont rush into him alot unless you know for sure your gonna get the hit on him, or its combo city for you. Good luck