Here are some codes that worked for my copy of Radiant Dawn NTSC 1.01 on Dolphin.
Infinite Gold
043CAB50 000F423F
043CAB54 000F423F
043CAB58 000F423F
Infinite BEXP
023CAB5C 00006000
023CAB60 00006000
023CAB64 00006000
Micaiah item slot 1 x99
00886ED0 00000063
Edward item slot 1 x99
008872C0 00000060
Heather item slot 1 x99
0088E100 00000063
Ike item slot 1 x99
0088A5F0 00000063
Mist item slot 1 x99
0088B1C0 0