Export char_bust_tex_lz77 from common5. Open it in a separate BrawlBox window, and uncompress the file by setting the compression to false. Now export your .brres files. You're going to rename them to MenSelchrFaceB###.brres
Refer to here for the numbering (Only the XX part, not the Y).
http://forums.kc-mm.com/index.php?topic=25.0Always add a 0 after the XX.
Example:
Sheik is 14 in that thread. I will add a 0 to make it 140.
So the file should be named MenSelchrFaceB140.brres
That's all.