When is alpha vulnerable???

When is alpha vulnerable???
try to get the grass shield style of megaman the after he stops attaking with his hands (2handsx3attacks)charge and attack repeat this lots of times till he is defeated. this attack will take 100 HP per charge.
use a guts style,break his plasma really quick and then use bodygaurd and he is dead,antidmg m,anti navi m (scrt net 2),muramasa m =awsome pa!