I want to breed one of my Pokemon, but I have it at a nice affection level and stuff. Would it lose all its affection/entertainment/the food/hunger thing if I put it in the daycare? Thanks in advance <3
No, it won't lose its affection. I put my Decidueye in there with my Ditto to get a Rowlet egg, and since I've brought it back into my party it hasn't lost any of its hearts; all five of them are intact. So, you're good.