asdf

Okay so this is currently for Fox. I have not yet tested Falco.
This is a flowchart of what to do when a Fox walltechs your edgeguarding stomp. And potentially cover EVERY option.
The most annoying option they have is walltech side b sweetspot, but this is gotten around by edgecancelling your stomp backwards and just grabbing ledge. Then, if they side b they'll just fall and die.
However, they obviously have other options such as walljump tech side b onstage, walljump tech side b shortens, walljump tech airdodge, etc.
How do we cover all of these options?
This is all based around the fact that fox sweetspot side b's after a walltech, not a walljump tech
This means you can take ledge (after say, an edgecancel stomp) and react to the walljump tech to start the option coverage.
If they did not walljump tech then you can simply stay on ledge, the fox will either side b or up b and you can kill them.
From here it branches into the reaction/option coverage of this potential flowchart.
When you see them walljump tech, you want to let go of ledge and fastfall for a frame or 2. This should be done roughly 16 frames into when you notice the animation difference. Might be able to be done earlier.
After this fastfall you double jump (into stage, slightly) and from there it's all reaction.
Let's start with the first option they have, walljump tech side b into ledge. You could uair this on reaction during your DJ but it would hit them into the stage and they could walltech. I found that if you nair on reaction to this during your DJ, you can hit them with the first hit. If they SDI up and in on the first hit then they'll go up with you and get combo'd. Any other DI seems to force them to up b or airdodge momentum trick, both of which can be reacted to and punished.

So their next option is walljump tech side b onstage (just above stage).
You can uair this on reaction during your DJ, hitting them onstage at which point you could follow them and techchase. You could potentially also waveland onstage and punish the side b.

Another option for fox is to go further from the walljump tech and mixup between side b onstage and side b shorten.
During your DJ, react and uair similar to last time, if you position yourself near ledge then the back hit of uair should hit the shortens, even mid shorten . Fox might be able to find a middle ground between the lowest falcon uair hitbox and ledge, but I could not find any from testing.
2 more options to go.
So lets say they walljump tech and go out to try to side b far to ledge, what are you going to do during your DJ? This is the coolest one to cover imo.
During your DJ you can react to this side b and haxdash back to ledge.... killing them.. it's so cool.
There's also walljump tech airdodge which can be covered with an aerial on reaction during your DJ, the airdodge has a lot of lag!

They have some more gimmicky options like walljump tech bair and walljump tech up b, but these would be pretty standard to cover.

Walltech jump waveland is an option if they get a high walltech. To stop this you'd simply low stomp their up b. However they could potentially get a high walltech with multiple SDI, which would force a mixup to this flowchart