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Rulekemon
(i.redd.it)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
It was released. The Azure Flute and the event where you meet and battle Arceus in the Hall of Origin in DPPt was indeed never released, but this is different.
Arceus had various distributions in 2009-2010; the US one was at Toys R Us for example. Trading that legit Arceus to HGSS and then bringing it to the Ruins of Alph triggers this event which takes you to a special location where you can choose one egg of either Dialga, Palkia, or Giratina.
Oh cool, so goat god optionally gives you baby Satan.
That's how I got my baby Giratina. But then I put it on my Pokewalker, and now it's level 2 and practically worthless.