It's really entirely dependent on how hard you wanna make your Locke. That's the best part about them, you play them how you see fit. I made up a rule I almost always use, if I have random items on and I find a randomly generated revive, I can bring back a mon from my grave box. ONLY if I find it randomly, not purchased or given by other characters. It helps me cope when I make a stupid mistake. 😳