Lots of footage just got uploaded at once. Some of it is more essential than others.
I haven't put up Marth footage in a while. Here's winners finals of a regional from last weekend where I played a mid-level Marth from a neighboring city. It's a clean 3-0 and a fairly good example of how you should be playing neutral against Marth. Set the pace of the neutral game by alternating between your low-commitment threats on Marth's space, including wavedash in/back dtilt/ftilt, spaced SH bair, and dash dance grab. Unfortunately Marth has a lot of similar threats on DK's space like dtilt, spaced fair, and a ridiculous grab range that forces you to space bairs on his shield really carefully, and he's more likely to get openings because DK is fat and he gets shield poked easily. The sad truth of the matter is that you will get randy tippered several times throughout your DK career and it will often not be your fault. Sometimes you just gotta suck that ****.
Shield stops (some people call them shield turns) are really helpful in this match-up and I show that pretty well against this Marth. When Marth players expect you to try to retreat and bair, they will attempt to pursue you and fair DK before he can start putting up the bair wall, which will also corner you and strengthen his stage positioning even if he wiffs the fair or trades. After conditioning them to attempt this, you can mix things up and shield turn, making that advancing fair unsafe and netting you a free shield grab which can start a combo. In certain situations they will allow you to place bairs out of shield for which you would otherwise be facing the wrong way, which is helpful when Marth is attempting to cross up your shield or go for a greedy shield poke. Observe examples at 2:50, 3:33, and 6:51.
Cargo uthrow dair platform tech chases are the name of the game for extending combos on Marth and tacking on percent at those awkward mid-high percents where you're unlikely to get more than one uair out of cargo uthrow (especially if the Marth is good with smash DI) but a cargo uthrow fair or a cargo uthrow uair won't kill. I'm going to attempt to explain what I've figured out about it so far, but this is stuff that I'm actively workshopping so bear with me here.
If you're moving from the top platforms to the side platforms DK's dair will have enough time to autocancel so he'll have no lag when he hits the ground, which will make it easier to react to tech in place with a regrab to keep the combo going or a grounded up-B to kill or set up an edgeguard. Unfortunately the extra distance between the dair and the platform below might give Marth a chance to meteor cancel, and he will always have his second jump at that point because you just finished uthrowing him. He can doublejump meteor cancel and immediately throw out an aerial to attempt to catch DK, but that's some pretty deep meta that most Marth mains will not be ready to pull out on the fly, mainly because no other character has a set-up quite like this ultra cheesy gimmick. Even if Marth does meteor cancel, he is still above DK with no double jump which is a really crappy spot for him to be. This will effectively end the tech chase, but you can react quickly with an uair if he's within range and start a juggle, or you can try to bait Marth into coming down into your shield with a fair or a dair and then up-B him to kill or set-up an edgeguard.
When going from the side platforms to the top platform, they have no time to meteor cancel but you also have to l-cancel your dair which makes reacting to Marth's tech options harder. You have to grab almost as soon as you land to grab tech in place; reacting is often not good enough, but if you know they like to tech in place when pressured this makes the read a little safer. Fortunately Marth's options out of tech in place aren't very good (he doesn't have tech in place spotdodge shine like a spacie) so missing the grab here may not be too painful. If they roll or spotdodge you can react to that and cover it even if you miss the initial grab.
If I know the player has a habit of doing get-up attack I shield as soon as I see they miss tech. If they get-up attack, you can shield grab it like always. If they do a neutral stand, react with a grab. If they miss tech roll left or right, wavedash out of shield and then grab (on bigger platforms like Dreamland and Battlefield it may have to be a perfect wavedash, but you should be grinding wavedash oos to be good at this MU anyway). If they don't like doing get-up attack then you can get meatier punishes like wavedash downsmash on reaction to a miss tech roll, or down-B, which has less follow-up potential but covers so much space on the platform. Depending on the size of the platform and where Marth hits the platform in relation to DK you can charge downsmash in a spot where you cover multiple options, which is especially useful if you're confident that they will roll or neutral stand. While downsmashing or charging up a downsmash, continue holding down on the analog stick; if you misread them and they mix it up with a get-up attack, you will be inputting a crouch cancel which may allow you to grab or downsmash anyway. You can also punish missed techs with jab resets, which is low commitment on whiff and can set up downsmashes, fsmashes, giant punches and regrabs depending on what option is best.
The reactions are really hard, and to be honest I'm not even really consistent with this stuff yet. However, these set-ups are a fundamental part of connecting your low percent juggles to your guaranteed KO throw combos. I want to master every part of my punish game so that any time I get a grab on Marth, I have airtight options that will lead to a kill set-up regardless of Marth's percent. You can see my attempts at these tech chases at 2:08, 2:53, 4:45, and 7:37. I don't always get the follow-ups but I literally started trying this out like last week so it's new to me, sorry to show off such sloppy play. Do you any of you guys have experience with these tech chases that you could share?
That's enough for now but I have some juicy vids I'll share tomorrow.