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.

Buckfire

 * Bronze Rank - Finish Buckfire with Hedgeshock's Rolling Spike or Rolling Dash.
 * Silver Rank - Hit ONLY Buckfire's weak point.
 * Gold Rank - Hit Buckfire with Model P ONLY by touch screen (on the lower screen touch the ! to throw a kunai).

Chronoforce

 * Bronze Rank - Finish Chronoforce with charged Saber (Model ZX).
 * Silver Rank - Finish Chronoforce with Buckfire Slash Dash.
 * Gold Rank - Hit Chronoforce ONLY with Queenbee.

Queenbee

 * Bronze Rank - Finish Queenbee by hitting ONLY the hive.
 * Silver Rank - Finish Queenbee WITHOUT any bees summoned.
 * Gold Rank - Finish Queenbee WITHOUT hitting the hive.

Rospark

 * Bronze Rank - Finish Rospark when s/he's in bulb form.
 * Silver Rank - Hit Rospark ONLY with Agoyle/Ugoyle.
 * Gold Rank - Hit Rospark ONLY with Rospark.

Argoyle and Ugoyle

 * Bronze Rank - Finish them in the same time by Model A's Giga Crush.
 * Silver Rank - Finish them in the same time by Hedgeshock's Spark Ball.
 * Gold Rank - Finish them in the same time by Buckfire's Double Tomahawk.

Hedgeshock

 * Bronze Rank - Finish Hedgeshock with Chronoforce.
 * Silver Rank - Finish Hedgeshock by knocking a summoned rat into him/her.
 * Gold Rank - Hit Hedgeshock ONLY by human/reploid form.

Bifrost

 * Bronze Rank - Hit Bifrost ONLY with Queenbee.
 * Silver Rank - Hit Bifrost ONLY with Buckfire.
 * Gold Rank - Hit Bifrost ONLY with Model A Giga Crush.

Vulturon

 * Bronze Rank - Make the battle last more than 2 minutes (120 seconds)(Do it with Gold Rank).
 * 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)