This item is found when you search the cave on your 1st trip to the volcano with dr-talico or it can be found in the phoenix statue on your second trip. It is used when combining to get a Phoenix.
Unlock Joker:
Go to the Volcano a second time with Dr. Talico and take the 1st right and follow the trail until you reach a large building with stairs. Search there until you find a mask and then combine it with any monster to get a Joker.
Unlock Gold Suezo:
Combine a Silver Suezo with a Bronze Suezo.
