Okay so I installed No $ GBA 2.6 about 4 days ago, inputed the Action Replay code that allows you to play HG SS on the emulator without seeing a black screen, and it worked great. Then on Thursday, I make it to Violet City. I save it, and then the emulator crashes right after I saved it. I thought "Okay I can just close it and re open it and everything will be okay." I thought wrong. The game loaded my older battery file. And I thought, well I'll just close it and worry about playing the game later. Later came, and I go to boot the ROM in the emulator, and it stops responding. >.< I've tried it multiple times, and every time it does the same thing! I even downloaded it a second time and the got the same result! So what could the problem be?
Saving worked for you in the first place...? I saved the game but the file was corrupt from the off. tbh, DS emulation seems to be a huge wildcard in most respects (at least, for most games), and as far as I can tell these things happen at random. It works perfectly for some people, and for others it might not work at all. This http://www.youtube.com/watch?v=xARwZ6Tf-TI has a decent FAQ and things. It has download packs in the description with everything needed to play it smoothly.. or at least, for some people. It worked for me until I tried to save, and at one point the ground turned entirely black, yet I could still see my character. Personally I'm just waiting for the US release, but otherwise I'd just download the Heart Gold Pack there and hope it works for you.