Sorry I didn’t reply to your questions immediately, every single question takes pretty long to look into to be able to give high-accuracy answers, so I took a short pause.
And quick question, but does shield grabbing override buffered inputs?
No. During shield, the first inputs that are checked are control-stick, then C-stick, and then buttons.
Could you pseudo-buffer a grab by pressing up on the c stick during shieldstun and then mashing z? Or would you have to let go of L or R after pressing up on the c-stick in order for this to work?
Z produces a grab even when L∨R are depressed. However, there is no incentive to do such a complicated string of inputs when you can simply grab on the first frame after shieldstun.
If a Fox or Falco dash attacks your shield, is it possible to wavedash OOS in place or backwards and then grab 'em before they can buffer a spotdodge?
Yes, it’s a 6 frame window. If you start the wavedash 6+ frames later than possible, Fox’s shine can hit you before you get the grab out.
Falco’s
AttackDash clean hitbox deals 9 damage instead of 7, which increases the shieldstun by one frame. Because the animation length is the same as Fox’s, your wd frame window decreases by one. Also, Falco’s dash attack causes him to leap forward much more than Fox, so if he “crosses up” very much, you will have to turn around at the end of the wavedash so you are able to grab him. Thus, the total window for the wavedash is 4 frames.
Anyway my question is what are the positions where marth can ledgecancel his up b on yoshi's story (frame window pls)? i know that this can work on other stages but you have to recover really high and it is very susceptible to being punished. also works on fod but im pretty sure it's not consistent because of the ledge being jank on that stage
It’s a zero- to one-frame-window depending on your falling speed. If you are hanging from the ledge and fastfall down, there is not a single frame on which an up-B can be done so that it edgecancels if you use the standard up-B angle. I also was not able to find any fastfall frame and up-B angle combination that produces an edgecancel so far.
It seems one requirement for an instant edgecancel is to land
exactly after frame 27 of your up-B. Whenever I landed after frame 28, it did not edgecancel.
Also, the YS up-B edgecancel is vastly different from edgecancel as we know them. With normal edgecancels, you slowly slide off the stage, but the up-B edgecancel looks more like Marth teleports off the stage. It might be a legitimate glitch or an intended property of Marth’s up-B. Also, I believe that the slope is also necessary in two ways:
1. Without the slope, it is not possible to land as early as after frame 27 – the slope makes the height of the edge you need to pass lower than the height of the stage where you land.
2. In theory, another way to force a land after frame 27 are rising platforms. However, when I tested it on Pokéfloats, landing after frame 27 did not cause the edgecancel. Thus, either the slope or the ledge might be necessary too.
Here are two gifs that explain everything I understand about it so far. The left animation is slowed down to 1/6th speed, the right one is slowed down to 1/12th speed with all frames that have added text being displayed for three seconds:
Edit: Maybe it’s more helpful to see all frames at once so you can look at them in the speed you prefer:
Edit: The large blue box is
not the item grab box. It’s the camera box. Sorry for making mistakes.