Alloys in "Final Fantasy Tactics Advance 2" are mission-specific items that have little to no use outside of those specific missions. These alloys are not naturally occurring and cannot be manufactured. Instead, you will have to find them out in the game world as you play through the game. You can acquire three types of alloy: Adaman, Mysidia and Crusite.
Instructions
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1
Obtain Adaman Alloy by completing missions 131, "Adaman Alloy," and 184, "Adaman Order."
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2
Collect Mysidia Alloy by completing missions 133, "Crusite Alloy," and 186, "Conundrum."
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3
Complete missions 132, "Mysidia Alloy," and 185, "Magic Mysidia," to obtain the Mysidia Alloy item.