f25a08f0_Secrets_for_PSP___GameRankings__Unlockable
[How to Unlock] Sting Chameleon [Unlockable] 
Near the beginning of the stage you will see a lone robot swinging his axe uptop. Jump onto one of his platforms and ride it out.
Mega Man Maverick Hunter X Cheats, Codes, and Secrets for PSP - GameRankings