Hi, do you happen to still have that Diancie up for trade?
If so, I couldn't help but notice that you erased your wants list from your signature. In light of that, I *can* currently offer you any of the following in IV sets of 4 or greater: Eevee, Marill, and Minccino. Competitive Larvitars and Shellders will be eventually up on that list, but I've yet to begin breeding them for my team.
As Kevin24 said, your Shiny Arceus is a hack, as I too got the same one over Wondertrade. I suggest editing/removing your post before things get a little too complicated to you, as it is against the rules to trade hacked pokemon.