You must play a pretty bad Marth. I do not even see how the DTilt spike can be used against him at all. The Nair can be easily avoided due to his sword can easily out range it. Bomb spam is about the best thing to do against a Marth. Projectile spam in general. Against Marth it's all about playing keep away with your little boy innocence.
I gotta agree with Rhan on this.
Marth is... depressing. Down tilt is a rarity in my matches against him. It is about projectiles. your grab is like the only thing that is longer than his sword (mostly). Nair is probably the best bet for air when face to face just cause it's range is helpful. When he's up, go for upairs but be careful, pretty sure his gay *** dair can time right and rip through.
Marth is such a douche. I'd rather fight spacies any day.
what kill moves do you use for y. link vs. peach?
dair.
dair is the main one. bomb to dair. anything to dair. especially if that ***** wants to float just above the ground and and be like "lulz I have no lag here I come" then just be careful with bombs get that ho in the air, BAM sword in the fff-f-f--f-face
up air works too, cause she's a floaty ho. if you're in the position, go uair. she can't do anything about it, from straight below.