I had Pearl, and got Diamond a little while ago. I placed a Piplup on the GTS to trade from my Pearl to my Diamond, but it won't come up when I search for it. I tried putting a Golblat up to trade from my diamond version and asked for a Piplup, but then when I searched while on my Pearl version it also didn't come up. I don't understand. Am I not allowed to trade with myself even though I have both versions?