pokemon diamond help

i need help regarding diamond.. I've already downloaded 2 roms and both of them do not work properly.. the first rom i downloaded froze early in the game when i enter prof Rowan's lab, thus i could not get any further. the second rom, whenever i enter the cycling route and route 208 all i can see is a white blank page and i could not get any further. i'm using ideas emulator.i need a good rom for a pokemon diamond, can anybody give it to me. also i need a good emulator to go with it.. if anybody has.. no rapidshare please, i've reached my lmit...

There's no differences between the ROMs there are on various sites, it's the exact same data. NDS emulation just doesn't work very well at all, random freezes and graphic glitches aren't uncommon.

These problems happens once in a while on my R4 as well. Sometimes I just reinstall it.