Actually, you can still do a boost pivot grab from standing...AND IT STILL LOOKS HELLLLLAAA LEGIT. I thought I explained this days ago T3T
So...In smash 4 you're still able to cancel your dash attack into a grab. You can tell when, during a dash, you press A and then R immediately afterwards. This will result in Fox doing a dash grab. With that knowledge in mind, all that had to be done was pivot it and BAM!!! BOOSTED PIVOT GRAB FROM STANDING POSITION!!
I will say that it is a lot harder to do on a 3ds because of no c-stick where the normal input would've been dash -> down on the c-stick -> other direction+Z for a boost pivot grab. For the 3ds tho if you dash and keep holding forward when you press A, you'll do a F-smash because smash. So the best input is going to be dash, half circle back A R. A button first in order to initiate the dash attack.
Also you can cross FD in just 3 boost pivot grabs....That is all