PokéBase - Pokémon Q&A
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Mew
Celebi
Jirachi
Deoxys
Manaphy
Darkrai
Shaymin
Arceus
Victini

Source: Mythical pages on Bulbapedia and this

Hope I helped!

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I guess I'll add that there are glitches you can use to begin a battle with the Hall of Origin Arceus in D/P without hacks. You still may not consider that a legitimate process, though.
That's fair, I don't really know how legitimate glitches are to people.
Arceus can he obtained in other pokeballs from the 2013 event.