ADHD
Smash Hero
As you may know, if metaknight downsmashes or shuttle loops from beneath during the animation of charging your barrels, they will deploy on contact and immediately deal 18% damage. This can also serve as a reasonable KO move.
In addition, almost all metaknights will on reaction shuttle loop if you are at a specific spacing near or above the ledge. Just time carefully an up b charge if you are standing directly over it (you can press forward while edgehogging and then immediately charge them as he draws near) and bingo, you'll take 8 damage at most and he'll take 18 with an obviously noticable more amount of knockback. It is risky, but you do not necessarily have to be standing on ground for this gimmick to work. You can simply drop down parallel to the ledge mid-air and charge them as he shuttle loops at you. The barrels randomly send you in different directions when you are hit with a physical attack and they explode on contact, so this may kill you or on a positive note--send you very far back onto the stage.
I suppose if they realize this and side b or tornado instead to recover, you can always charge your barrels to the opposite ledge or rehog.
In addition, almost all metaknights will on reaction shuttle loop if you are at a specific spacing near or above the ledge. Just time carefully an up b charge if you are standing directly over it (you can press forward while edgehogging and then immediately charge them as he draws near) and bingo, you'll take 8 damage at most and he'll take 18 with an obviously noticable more amount of knockback. It is risky, but you do not necessarily have to be standing on ground for this gimmick to work. You can simply drop down parallel to the ledge mid-air and charge them as he shuttle loops at you. The barrels randomly send you in different directions when you are hit with a physical attack and they explode on contact, so this may kill you or on a positive note--send you very far back onto the stage.
I suppose if they realize this and side b or tornado instead to recover, you can always charge your barrels to the opposite ledge or rehog.