I tested them and found that codes like these work:
Max Zenny (Press Select)
94000130 FFFB0000
020F93B4 000F423F
D2000000 00000000
::All Battle Cards (Select)
94000130 FFFB0000
C0000000 0000018D
220F8D74 00000063
DC000000 00000004
D2000000 00000000
But the hp 9999 and All War Rock weapons dont seem to work, and the codes i tried havent crashed my game yet. This is where I got the codes
Ar codes for the US version of Mega Man Star Force 3 : Black Ace? - Yahoo! Answers