Video demonstration of the Retry-from-Last-Battle (RfLB) box respawning method. I was able to go from 0 Potions to 99 in 70 minutes, compared to the roughly 2 hours it took me with the old method to go from 20 Potions to 99. A big helper is that in each cycle you are now destroying eight boxes with potential good rewards (one of the boxes always rewards an MP mako shard), compared to the four boxes in the previous method.
The faster area to grind for Potions and Moogle Medals with the RfLB method would probably be when you're escaping from the reactor, right before facing the first Shock Trooper. But if you're aiming for an early grind, this area before the cut fence (see video) is likely the fastest.
- As a bonus I made this second grind for Potions so that I could also grind limit break usage, now that I can safely become a sponge for damage. The menu denotes Cloud's- and Barret's respective limit breaks as being Level 1.
Cross-Slash: Level 1
Fire in the Hole: Level 1
After repeated usage of Cloud's Cross-Slash I did not accomplish any level-up however.
Stats of my limit break playthrough
Cross-Slash used: 18 times
Enemies defeated with Cross-Slash: Security Officers x6, Guard Dogs x2, Shock Troopers x2
Number of times used on Scorpion Sentinel: 9 times
Of course, there are three possible conclusions here without further data.
A) The mechanics for levelling up limit breaks are deactivated for the demo
B) More of the same is required for levelling up, be it LB usage or number of enemies defeated
C) Later game content is required to level up limit breaks
I'm almost definitely missing/forgetting some news that have been shared online about limit breaks in FFVIIR. But if somebody here decides to spam Cross-Slash throughout the demo, please try to accomplish at least 20 Cross-Slashes so we can learn what happens (if anything at all).
Keep in mind you'll have to do some extra grinding for Potions along the way even if you got 99 at the very beginning, since you'll be taking A LOT of damage to build up the limit bar.
Not that it matters but I only just now bothered observing that landing a limit break does NOT add to your ATB.
- At least in the Scorpion Sentinel's final phase it is easy to get the boss into a loop by standing behind it and causing it to use Tail Swipe repeatedly. This attack is easy to dodge and by locking the boss into this loop they will never use missiles or even EM Field. May or may not be useful, since to actually advance the battle further you still need to switch characters and accomplish things from the front.
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New personal record for number of Moogle Medals: 37. Not trying to max out Moogle Medals, this is just the number I've gotten while grinding Potions.
I was confused as to why Focused Thrust and Focused Shot did so little to raise the Pressured gauge much of the time. Was it randomness? The angle from which I attacked? It took me this long to realize that the "phase" of the enemy/boss is what determines the effectiveness of stagger-centric attacks. I think a main reason for my confusion was that the "Pressured" gauge is visible even when the enemy is not susceptible to having that gauge filled quickly. 
Definitely makes the Sweeper and Scorpion Sentinel battle(s) way easier now that I know what I'm doing!
