first few steps are for action replay ds only
find your newest codelist (it should have the codes you want to edit in it)
open it in notepad
pay not atteaion to the .xml writing and just to the code on it.
(next steps for everyone)
fine the code you want to edit. i will use the code below to give an example
infinite lives(kirby squeak squad)
first lets add a activator
lets test the code... oops forgot to add the end.
now lets end it
now lets test... yay it works, i get infinite lives but only when i press L
now lets change the ammount of lives(knowing how to count in hexdecimal will help you greatly)
here are the part of the code to focus on
63 in hexdecimal=99. lets make it 50. 50=32 in hexdecimal.
so the code is
now i still have infinite lives but 50 shows in the box that shows how many lives i have.
thats the basics. this is not limited to basic health cheats. you can use it on any code that is some what simple. just dont change the first 8 digets of the code or it will not work properly. if you change the second part of the code in a different code your results will be different. you might find the place were it changes the item or place the item is put.
i hope this helps! please comment and rate! post sugestions or things to add in the instructable.
happy hacking! :)