I believe you can use AGP to revive your team if they fall in battle, but it’s a waste. Shop currency is usually shared between save files, so if you spend it in one file, it’ll be gone even if you load a different file.
Also, Exe-Create may not allow you to spend Shop currency to revive if you are fighting the ultimate optional superboss. I learned this when fighting the ultimate optional superboss of Wizards of Brandel. When my team got KO’d, the game displayed the message
Q: Why can’t I revive?
A: It’s the final battle! You can’t cheat here!
Favorite RPG of all time: Journey to Kreisia (by Exe-Create)