Hello... Me and some friends has been tested the pokemon hg/ss rom by more than 3 hours (without shutdown the nds) and NO freez. Why?! Simple, we use the R4 v1.23 (I don't know if it's unnofficial or not but... the game WITHOUT patchs (*clear* rom or v2.5 English - I hate don't know about what's the next pokemon my rival send xD) -NO freezes during gameplay... -NO blackscreen's enter/exit any House's/places -FAT (or FAT16 Micro SD Sandisk Card) -R4 v 1.23 firm. -I've 2 medalls and a sucker Totodile... Well. Check the website for download the firmware: http://www.r4li.com/download/r4.html See ya!