Since it came up in a versus thread I figured it was worth updating Monet's and Tashigi's Lifting strength.
For Monet:
Luffy tried to chase after Caesar but was stopped by Monet who held him back by grabbing him
Later she grabs Luffy who wasn't able to just push her off to escape and destroyed the ground beneath him instead.
Thus Monet would scale to "At least
Class G (Held down Base Luffy)"
For Tashigi:
Tashigi was able to hold down Monet and stop her from ripping her arm off, thus she would scale to
Class G as well