Can some of these GBA Pokemon games (Like Shiny Gold) trade with legitimate Pokemon games like Emerald or Firered? Shiny Gold is sometimes in a cartridge so if i put a link cable between two GameBoys, Will it be possible to trade? It woould be pretty cool to have a shiny Gyarados in my Emerald. I think I read that Shiny Gold Pokemon can be transfered through Pal Park.
Most of the hacked pokemon games can trade with legitimate copies. I have pokemon Dark Cry and traded a mew in that to my Sapphire version. As far as pal park goes, most of those cartridges are made poorly and when your DS tries to access the GBA cart it will erase the data. (But I have only heard of this happening to fake copies of FireRed)