I can trade with myself on my GB/GBC/GBA games by opening 2 VBA emulators, but even tho my DS emulator enables wi-fi, I can't seem tot rade with myself, or others. Got halfway through a trade with a friend once and we both got a weird error that's apparently common in trading -.-
Took us 2 hours to get past a few other errors lol so we just gave up xD