VegaNovus
The Soul Provider
People seem to think is achievement is impossible, whereas, if you use your head its pretty simple, quite simply, have either, Hope, Vanille or Fang in your party as leader (easiest done with Fang), get into a battle with an enemy with say, more than 500k health and make sure you use Deceptisol so its easily staggered.
Once in the battle, stagger the enemy, then very quickly Summon the Eidolon, I summoned Fang's Eidolon, keep hitting until your Gestalt bar goes up, it goes up VERY fast for Fang if she is a commando, once completely full, enter gestalt mode and use your Level 3 Finishing move (Y or Triangle)
I can't stress enough how important it is, to make sure your Gestalt bar is full before entering gestalt mode so you can do your level 3 attack..
I can't stress enough how important it is, to make sure your Gestalt bar is full before entering gestalt mode so you can do your level 3 attack..
This should easily inflict 100k of Damage in one hit.
Note: The achievement/trophy doesn't pop until the battle is complete.

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