Speaking of edgeguarding, bombs are good too! Well, against other grapple recoveries and such. Sorry if it seems like all I do is talk about bombs, but it's only because nobody else does.
A safe mixup against grapplers rather than just going for the dair (because this can prove dangerous if they catch on) is to just run towards the edge, drop a bomb, roll back, and see what happens. I've done this in a couple of Samus dittos.. they're on video somewhere.
Also, to reiterate about my other bomb trick.. Ledgejump bomb cancel, I think, is a better alternative than just simply ledgedrop double jump bomb because ledgejump is a "ledge action" which inherently grants some invinincibility frames, no?
In any case, to do it, when holding the ledge, just tap jump, and you'll hear two "whoosh" sounds. Try to input the down B command a bit after pressing jump, so that you cancel the second "whoosh" sound (this is Samus launching into the air) with a down B.
What's neat about this is that you're at the perfect height to roll low back onto the stage if your opponent predicts a jump because of the initial jump animation, which allows you to land in ball form and cancel into a buffered spot dodge, roll, shield, dtilt, what have you.. OR you can DI back onto the ledge and stall some more, or if you want to edgehog with added bomb pressure off the ledge (it explodes a bit under you) Depending on how you time your down B input you can get different heights to allow for different things.. Just throwin it out there.. Hope it gets put to use.
What else should I add.. Edgeguarding.. Well, a sex kick has the right knockback so that you can zair right after it (I've done this a few times) and homing missiles are slow enough so that you can catch up to them and dair right when they go off. It's kind of hard for the opponent to handle both coming at them.