The easiest way would be bidding in the Graszton auction after becoming the area champ for life. It's the grand prize there. --- You're too soft, Youmu~ Santa, why do you never bring me any presents? That's because your family is poor.
you can get it from trading balots with other people, but i got the items from from quest like pococo's chocobos in chests plus stealing lvl 3 loot from random encounter monsters helps at getting the items.