Supermodel From Paris
Smash Hero
You have to pivot grab.d-smash infinite? you can't stun someone more than 2x in the air until they touch the ground again, at least thats what happens when I tested it
Grab release, dsmash, pivot grab, release, dsmash.
EDIT: To clarify, you can always pivot grab someone after a dsmash to reset the counter, it's just that Wario is the only character that allows a dsmash after grab release or you could do it to everyone.
If you pivot grab Meta Knight out of dsmash, fthrow him, and for some reason land another dsmash, it will stun him. Pivot grabbing resets the counter, or maybe it's just grabbing from behind, I dunno. The reason is because when you grab someone from behind, it forces their foot to touch the ground.