im trying to play dragonballz legacy of goku 2 but when i get to the part where gohan has to go into the world map it displays a message thats says the device wont run on this haardware or something like that can somebody help me out
I think this belongs in "General GBA Emulation Discussion." As for your problem, sounds like copy-protection to me. You might want to play with the emulator settings a bit.
Its quite easy actually
Just delete your save games (if you have created any)
Then in VisualBoy before you start the rom go to Options-Emulator-Save Type and then select EEPROM and Flash128k then close visualboy start it again and start your game again from the beginning