Unfortunately, the black screen freeze is occurring on all games that have been released for the 3DS system, and it seems that it is an issue with the hardware. This is an issue that Nintendo is aware of with the 3DS system.
From Nintendo's Support page:
System Freezes and Displays a Black or White Screen
The system is frozen (locked-up) and displays a black screen
What to do:
Press and hold the POWER Button down until the system powers off. Then power the system back on.
Still Not Resolved:
If the system is still freezing and displaying a black screen, the system will need to be repaired. To start the repair process, click here.
Click here to read the article on the Nintendo site.