I just wanted to ask, is there something else the XP potion can be used on? Cus I'm using it on the cutie forest knight, around 3 times already, and the Winner's quest hasn't been fulfilled yet.
Nope, he's the only one. If you use it on him the quest gets marked as completed. I really don't know how it could not work. Are you maybe pressing the top-left back button instead of completing the battle normally?
Oooooh! You complete the quest by using it from your inventory while still battling him. I never considered using it in the scene after as being part of the quest
