I am also having trouble with the member card code for Diamond. Except my problem is that the guy at the mart always seems to give me Oak's Letter, even when I alter the numbers that are supposed to give me the card. The code is as follows:
94000130 FCFF0000
B21C4D28 00000000
B0000004 00000000
0000AA3C EDB88320
2000AA80 00000008
D2000000 00000000
The last number on line 00000008 varies. I've experimented with using 7, 9, and A instead of the 8, and all I keep getting is Oak's Letter!