So does anyone have any actual good methods for completing Mushroom No. 8? I tried both of the supposed "foolproof" methods, those being:

1. Fatal Crest + Berserk Charge + Fantasia
2. Master Form + Berserk Charge

And neither of those methods are working for me. Like, at all. Seriously, this mission is fucking bullshit and is starting to seem like it'll be the absolute last damn thing I complete because it's just that fucking hard.