no there isn't any cheat codes,but there is unlockables
go to the gameshark and go to add new cheat and put the cheat
gameshark
gameshark
I really hope your hopes aren't up. Its impossible to do a gameshark cheat for max exp...
http://www.cheatscodesguides.com/gameboy-advance-cheats/metroid-zero-mission/
it is a gameshark cheat 99 thundersones
Use a gameshark
only with a cheat or gameshark!!!!!!!!!!!!
You can't
Use a gameshark.
You can't "hack" Metroid prime hunters yourself. If you need to cheat, you can get an action replay that "hacks" for you.