need help hacking a gcn game

i've almost got a password for the forbidden four in animal crossing. i've got code generators out my ears, and the source code to some of them. i can send all of this to anyone who thinks they can help. for a small explanation...

when you give the code to nook, you give him a 28 character code. well the game breaks it down into 21 hex addresses. they are called code bytes. code byte 0 tells the game what kind of code it is, code byte 1 and code byte 21 are basic code modifiers, code bytes 2 throuh 18 tell the game the town and player name, and code bytes 19 and 20 tell the game the item to give. i have the numbers to all items. all i need is to be able to force code bytes 0 and 1 to be what i want. it would be nice if i could force code byte 21 too.

now, i didn't know where to post this. i cant post in the forums where it looks like this would go, so here it is.