OK Guys bit of an update here, those same pokemon that prompted me to write this thread have now been traded, they were darkrai and shaymin caught by hacking the items, now i have traded hacked item poks before with no problem (both as soon as they were allowed on the GTS) but the other day i wasnt allowed to trade them, i tried LOTS of times with no luck even though they were both on the GTS, so i assumed the hax check changed, but i tried again a few days later and those same poks are now traded.
Strange...