Yen Sid
Yen Sid is a common evolve medal in Kingdom Hearts Unchained χ / Union χ.
Two Yen Sid medals in addition to two 4★ Good Fairy medals of the matching color are used to evolve a 4★ medal to 5★.
You can obtain Yen Sid medals by completing the Low level mission in the second set of special quest on Fridays or by beating Guard Armor or Guard Armor Subspecies raid bosses.
Yen Side medals can also be obtained as a random drop from the rare enemy Great Pretender in Quest 174 or 206 (two potential Great Pretenders), and rarely from Pretenders in 270.
Gallery
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The original Japanese 4★ art