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 00000063
Freeze Unit Levels
* Used with infinite BEXP, this is good for leveling up repeatedly until you hit stat caps.
*You can replace last two digits for different levels. For reference, 01 = Level 1, 14 = Level 20
*Not everyone is listed.
Edward
008871FE 00000001
Nolan
00884E8E 00000001
Micaiah
00886E0E 00000001
Sothe
0088A13E 00000001
Ilyana
0088C4AE 00000001
Leonardo
008875EE 00000001
Zihark
0088662E 00000001
Volug
00885A5E 00000001
Lucia
0088917E 00000001
Nephenee
00888D8E 00000001
Brom
008885AE 00000001
Lethe
0088956E 00000001
Mordecai
0088995E 00000001
Heather
0088E03E 00000001
Astrid
00893EBE 00000001
Marcia
008881BE 00000001
Geoffrey
008936DE 00000001
Kieran
00893ACE 00000001
Danved
0089469E 00000001
Makalov
008942AE 00000001
Elincia
00887DCE 00000001
Haar
0088C0BE 00000001
Leanne
0088BCCE 00000001
Nealuchi
0088B8DE 00000001
Calill
00889D4E 00000001
Ike
0088A52E 00000001
Mia
0088E42E 00000001
Rolf
0088B4EE 00000001
Shinon
0088D07E 00000001
Soren
0088AD0E 00000001
Titania
0088A91E 00000001
Oscar
0088CC8E 00000001
Boyd
0088C89E 00000001
Gatrie
0088D46E 00000001
Mist
0088B0FE 00000001
Rhys
0088DC4E 00000001
Ranulf
0088EC0E 00000001
Kyza
0088EFFE 00000001
Lyre
0088E81E 00000001
Reyson
0088F3EE 00000001
Fiona
008903AE 00000001
Jill
0088623E 00000001
Ulki
0089ACFE 00000001
Janaff
0089A90E 00000001
Please let me know if these work for everyone else. I'll update this post when I discover more.