DeMoN said:
No, you can not use Rudolph's tool for Heart Gold as of now.
I'm not really sure if it'll ever be updated either.
Well, there've been a few patches for various Rudolph apps after he stopped development... the NDS Backup Tools actually got an update not too long ago, but it was just so that they'd properly dump the header information of some post-DSi carts.
It's not outside the realm of possibility that someone in the know may patch the Backup Tools for Hg/Ss, considering how massively popular those games are. Hopefully they are, as not everybody is willing to spend $30 on the hardware necessary to dump those saves. Although the NDS Adapter certainly is much more convenient than using homebrew to do it, for those who are willing to buy it. I'm expecting one in the mail next week... hopefully Monday.