something like cheat.dat....

how do you make a .dat data that contains AR code???...

You mean like these?http://cheats.gbatemp.net/Temp/

yeah...something like that....

Replying to #3

Or were you trying to make a custom one?You can edit any part of the cheat databases once you download them.

Yeah..I like to make a custom data....but how do you edit the database???

Replying to #5

Open it up in Notepad.Make edits and then save it.

Or if you want something with a little more features and a nicer GUI, try using R4CCE, which makes it easy to modify Game IDs, (find Game IDs)
http://hp.vector.co.jp/authors/VA013928/soft_en.html

Use R4cce to make and add cheats to a .dat cheatdatabase