Sorry to revive an old thread, but this seems like the right place to ask. I have 2 questions.
1. I'm playing Soul Silver and have the same problem as OP (Sprite issues, crashes, etc.) and I know it's because of an "incompatible" rom base. To get this working I need to inject the game into a better host. Does anyone have experience doing this? NDS2WiiU won't work, because it doesn't allow you to change the rom base and NDS2VC contains a Trojan according to my Antivirus:/
2. I have already played the game for a while and would absolutely hate to have to start all over again with the new host game. Does anyone know how to make the Loadiine save work with the new host? Is it even necessary to make any changes to the save files, considering it is sort of the same game?
EDIT: I found a way to maually inject the rom and thankfully, my savefile is working just fine. Unfortunately, even with Yoshi's Island DS as the host file, I STILL have Sprite Issues and somewhat frequent crashes. Damn:S