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Old December 17th, 2011 (10:53 PM).
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Bela Bela is offline
Pokémon Rose Creator
Join Date: Apr 2009
Location: United States
Age: 26
Gender: Male
Nature: Modest
Posts: 327
This is a very easy question to answer. It's Arceus.

Originally Posted by Plate Engravings
"The Original One breathed alone before the universe came."
Originally Posted by Bulbapedia
Arceus is also known as "The Original One," as it is said that it created Sinnoh, and possibly the entire Pokémon universe, along with the lake guardians and creation trio.
Mew's status as the ancestor of all Pokemon has only ever been speculation.