So I ordered FFX/X2 for the vita.Don't look if you want to figure it out yourself:
I'm having a hard time unlocking the door in the temple located in the calm lands. I captured the fist set of monster for the Arena Guy and he gave me a chest I cant open. So I capture the second set of monsters for him and he should have given me some sort of crown. He didn't give it to me. So i can't open the door. Which means I also can't open the chest.
Spoiler for Hidden: