Regarding online emulation iOS

Hello, I just re-found this website after God knows how many years but after browsing for a little bit, I remembered this name and I’ve been checking out the online emulation and loving it. I’ve had basically zero issue with older consoles up to about the 16 bid error so 32 bit, but while trying the Nintendo DS games I have not been able to get one to fully booted up and it loads the bios. OK It downloads the game it everything and then I believe goes black or nothing works. I’ve tried a few Pokémon games and wonder if anyone has had this issue with iOS or if anyone has any advice regarding these online emulators on iOS