Visual Boy Advance is what i use, and i'm pretty sure everyone else does too. :)
just google search "visual boy advance" and download itt.
i've downloaded the beta 3.1 patch, and i patched it onto my firered rom that has already been patched to sienna beta 3.
now when i opened beta 3.1, and i try to load my save states, it says: "Cannot load saved game for Pokemon Sienna:)"
what did i do wrong? i only had the 7th gym left to beat, and i REALLY do not wanna haveta redo this whole game cuz i dunno how to patch things right. haha.