I have a shiny Tentacruel, Gyarados, Linoone, Sandslash, and Swellow. I also have two Groudons, a Kyogre, one each of the Regis, a Chikorita, a Torchic, a Phione, and a Latios.
I'll trade you any of those for either Darkrai, Shaymin, or both. It's up to you.
But I have to transfer them from...