I may have found a slight problem or bug with beta 2 and I'd just like to point it out for future reference.
While playing, the screen turned red near the bottom right corner of the first gym just after being challenged by a trainer and froze. I encountered another frozen screen, this time black, in some nearby grass as I encountered a Pokemon. Clean rom, too.
Great hack by the way. It's hard to quit playing. Even late at night.