So, I'm here... playing around at 4:50 in the morning waiting to go to SLAST... and I just "found" something kinda useful for covering your opponents landing options. It's really hard to describe, but it's like just pivoting back and forth with your dash repeatedly. This gives you the opportunity to choose between pivot grab and upsmashing your opponents landing (or you can perfect pivot into a forward smash or dsmash, but that's more risky)easily at the absolute last second. If you do it right it looks like Olimar is ice skating...
I dunno if I'm just mentally out of it, but I think it's pretty handy, idk if I will get it down before being able to test it at SLAST.