Sorry it took a while to reply, I almost never check pokecommunity anymore, since I post at Skeetendo now. If you want to edit stats manually in a hex editor I could give you the data structure, but there are programs to edit a pokemon's stats as well. I believe Yomamathecableguy made one which should be posted somewhere here on PC in a toolbox thread of his.
Hello man, I'm Wesley FG, one big fan and admire your work!
I know your abilities about hacks in GBC,
I have one question for you,
How to edit the status (Type, ATK,...) of Pokemon Gold GBC ?
for change for news pokémon (5°gen),
If this should be done in hexadecimal, is there a tutorial? or you can help me how to start? (eg the offset of the beginning of the Pokemon data, and what they mean)