I posted this on GameFAQs, just gonna copy and paste it here for anyone who's interested:
And here's a very low quality video of the strategy in action (sound is unsynched and video randomly speeds up in places, sorry):So I just beat MF using a slightly different strategy than I think most people are used to here.
Character: Ventus (Lv 57)
Keyblade: Void Gear
Abilities: All
Deck:
- Milky Way x3
- Milky Way x3
- Milky Way x3
- Milky Way x3
- Milky Way x3
- Milky Way x3
- Curaga
- Curaga
Seem odd? It's actually very effective. Using 1 Milky Way puts Ven into the Sky Climber command style, but using ANOTHER Milky Way maxes out his Command Gauge unlocking the Sky Climber finisher instantly. This finisher move will take out 1-2 bars of health assuming MF is grounded and doesn't block it, and in practice I've been able to kill him by pulling off 3-4 of these finishers.
You need to wait for an opening to use the Milk Ways so that he doesn't kill you while you're doing the eating animation, and dodging attacks while in Sky Climber is definitely more difficult than simply dodge rolling (although being in Sky Climber does allow you to dash out of MF's whip attack after it's caught you, avoiding damage, for some reason).
Despite these challenges, this seems to be an easier method (IMO) of taking down MF than the standard Thunder/Fire Surge strategy.