Pokémon HGSS Action Replay Shiny Cheat
EDIT: Before you ask me to help because this doesn't work or whatever problem you're having, please don't. I do not have access to an Action Replay anymore, I simply cannot help you beyond what I provide here. I find that usually when someone has a problem with this, it's because they missed a tiny little mistake they made when putting it in. I know it's a pain, but if you just can't seem to get this to work, go through every little bit of it and make sure it's exactly as I have written. If you've triple-checked (and not just skimmed!) and it still doesn't work, I'm sorry, I have nothing more to offer. I've done my best. I had hoped to keep my post as close to how it was originally, with just a little note added saying I couldn't help anymore, but I guess a bunch of people just happened to overlook it, so I finally went through my post and took out anything saying I would help them at all if this didn't work. I left the poll alone, however, since changing it would reset the whole thing. This does not mean you should ask me for help (obviously, that's the whole point of this edit). I'm sorry, I really am, but I can't do any more than what I've written here anymore.
Okay, I've seen a lot of people asking about the Action Replay shiny cheat for Heart Gold and Soul Silver, saying that nothing they've tried works. A friend of mine had an Action Replay, and they couldn't get anything to work either. They let me try, and I got it to work on my first try. I figured I might as well share what I did. Now, this may look familiar to some of you, but I promise I tried it and it does work. (Note that I'm using the US version.)
Okay, now like most Action Replay cheats, I pressed L+R to activate it after I loaded the game. What I did that some people probably didn't, however, was go into the trainer card and press R+A. I remembered doing that for Pearl, so I figured, why not? I went into the nearest grass, and the first pokémon I found was a wonderful shiny Gloom. I handed it off to my friend, and it's still working just fine. (By the way, in Pearl you used to have to go into the trainer card and press L+A to deactivate it, if you don't want to just turn the code off normally. I figure it probably works here too, but I haven't tried it.)
Oh, and if it doesn't work, first make sure this is the only code you're using and see if that helps.
I hope this helps all of you frustrated shiny-seekers!