Dragon Quest Monsters Joker: 13th Darkonium

Hi. I just visited my last shrine and become the ultimate form. the story tells me to visit the bell tower now. now i have my position of the game clarified. my question is where can i find the 13th darkonium? i heard there's a total of 13 in some forum. Right now I only have 12. is the 13th later on in the game or did i miss it somewhere in the past?If you know, please enlighten me. If you don't, no worry. cuz the extra 3 isn't required in the game story. i just want to feel complete.

Hi. I found my 13th already. I posted this long long time ago. But thanks for the reply. Yeah, there is 13 darkoniums total. You only need 10 for the game though. The extra 3, you can sell it for about 3000-4000$ each. They put it into your inventory instead of where the first 10 on your upper status screen darkonium location.