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>the creation trio are called Arceus' 分身 (bunshin), "doppelgängers", "other-selves", "alter-egos" in the japanese version of Pokémon Diamond-Pearl and Pokémon Platinum
>as such, Dialga and/or Palkia is/are revered as pokémon behind the creation of the universe and in order to stop such reality-manipulation powers you need the beings of knowledge, emotion and willpower
>when the avatar that makes time move with its heartbeat and the avatar that expands space with its breath are both being used to bring ruin to the world, a third, furious avatar appears to keep things in check in Pokémon Platinum
>Pokémon Legends Arceus introduces the Diamond Team and Pearl Team, two cults that worship different aspects of シンオウ (Shinō) or "Sinnoh", the pokémon god behind the creation of the universe. They later find out these aspects of Sinnoh are the two avatars known as Dialga and Palkia.
And then, at the very end of the game, when you have subjugated the three main avatars of Sinnoh (Dialga, Palkia and even the chaotic Giratina) and completed the request of this god, you meet it at the top of Mount Coronet and are bestowed with but a fragment of its might, Arceus, the only being we have ever seen creating pokémon life (the only instance of a pokémon egg being seen appearing).
These legendary pokémon are the different parts of Sinnoh, the one true God.