ok so people say anti form is some random thing that happens from abusing drive buts its not
ok so everytime you drive into valor wisdom or master you get like a anti point
the chance that you go anti is based on this
0-4 anti points=0% chance
5-9 anti points=10% chance
10+anti points= 25% chance
but there are like modifiers to the odds of going anti form
most scripted battles=x2
battles against oganization members=x4
battle against the end boss in his armored form=x10
these are the ways you lose or gain anti points
change to valor wisdom or master=+1 points
change form while ally is unconscious=+0 points
change to anti form=-4 points
change to final form=-10 points
obtain new form=drop to zero
uhh i hoped this helped
and one other thing you can final form by randomly driving after you meet up with the 13th member in the last world