You actually have the face the ledge to grab it.
Regular di is insane in this game, which also allows you to do techniques with the di such as Ledge di and reverse ledge di
Heaven platform B canceling, you can cancel Fox's shine to instantly land on the ground, kirby's down b to instantly slam into ground, and samus down B to fall as you use the bomb, and a few other characters, like Falcon can do his falcon kick off the platform, link can descend with upB off it.
Link can also invisible bomb glitch, and descend his UpB's by sliding off the edge as he does ground UpB.
Ness can quick grab ledges and extend his ledge grab with downB
Pikachu can do double vertical upB
Mario and Luigi can extend their upB
Jigglypuff can teleport, in japanese she can slide as well.