Mega Man ZX Advent/Medals

Medals can be obtained from bosses that you fight, both the Pseudoroids and the Mega Men. these can be obtained by defeating the boss without sustaining damage. The difficulty of this varies depending on your skill and the boss you fight. There are 24 medals in all, which are available from every boss you fight. These medals are needed to unlock a hidden model after you complete the game.

Vulturon

 * Bronze Rank - Make the battle last more than 2 minutes (120 seconds).
 * Silver Rank - Finish Vulturon off with Aoleus' SonicBoom.
 * Gold Rank - Defeat Vultron with ONLY the Giga Crush (best advised to do this before you get weapons meter upgrades)

Aeolus

 * Bronze Rank - Make the battle last more than 7 minutes.
 * Silver Rank - Finish Aeolus off with Grey/Ashe' Giga Crush.
 * Gold Rank - Defeat Aeolus with ONLY the SonicBoom (A-Trans Aeolus VS Biometal Aeolus).