1, Download Dragon Ball Z - Extreme Butouden JPN to your PC. You can download the game here: http://www.3dsiso.com/
2, Download the newest Sky3ds template file and newest Sky3ds DiskWriter:
---Sky3ds template file(06/14/2015)
---Sky3ds DiskWriter2.02b1
3, Insert micro sd card into a card reader connecting to your PC, copy the downloaded sky3ds template file and diskwriter to root of this micro sd card. VIEW INSTRUCTIONS IN PAGE HERE.
4, Insert this micro sd card into Sky3ds and insert Sky3ds into your ds/3ds console, turn on your console:
5, Run the game and enjoy playing Dragon Ball Z - Extreme Butouden JPN:
Please note you tested on DS console V9.8.0-25J and 3DS Console V9.1.0-20J, both works great!