Being the horder that I am, I've transferred a good portion of my pokemon from way back in Generatoin III to this game. I see someone offering 5IV Stealth Rock Pineco for a Suicune on GTS and I think to myself I can part with the Suicune I have sitting in my box. Except it says it's a special pokemon so I can't trade it. This is a Suicune obtained from Colosseum and since I can trade a Regeice I can only conclude the reason I can't trade my Suicune is because it was a Shadow Pokemon. Am I right in thinking this and if so why is this limitation in effect?