f25a08f0_Secrets_for_PSP___GameRankings__Unlockable
[How to Unlock] Armored Armadillo [Unlockable] 
At the end of the stage when you reach the moving platforms, jump from the highest point over to the right, you will see a new platform, ride it out.
Mega Man Maverick Hunter X Cheats, Codes, and Secrets for PSP - GameRankings