The souls part makes me think the number found in Revelation refers to people, or at least sentient beings. There is 144,000 as in the number of people that God saved
but there isn't even a monster in FFX, let alone one that can be Bribed for Remedies, with 5760 HP (the amount needed to be Bribed for a minimum of 144,000 gil). My other line of thought is the Four Horsemen of the Apocalypse. In fact, now that I think about it, that's exactly the number I need.Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel. (Rev 7:4)
Solutions to your problems - we've established that it's Remedy
Just consult your opponent - we also know that this is Bribe
The same amount as souls - You can Bribe one of four, and only four monsters, to get Remedies; Ragora, Sandragora, Grat, and Ochu.
On the day of judgement - Four Horsemen
I don't know how to put this into a logical answer, so I'll say four is the number you're thinking of, for the above reasons.
And BTW, 42 actually does exist in Revelation...
But exclude the outer court; do not measure it, because it has been given to the Gentiles. They will trample on the holy city for 42 months. (Rev 11:2)![]()