Not trying to defend Gen 4, which it's Legendaries are cool but not my favorite, Arceus you can not deny at this point is indeed the GOD pokemon, it's design comes from a lamb or horse which are both representations of Jesus. the Lamb being Jesus and The Horse Jesus steed, it also has a hoop upon it that resembles the spindles behind these creatures called Cherubim, which are the four guardians of Gods throne. Arceus thousands of arms are indeed the Unown because Arceus calls upon them using his power, the Azure flute sounds like an Unown calling for help, Arceus comes to you because he though it was an Unown needing assistance, we also literally see Arceus create the Legendary Pokémon of Time, Space and Anti Matter. Arceus was a concept sense Gen 2,
https://archive-media-1.nyafuu.org/vp/image/1418/01/1418013284482.png, right here we see a man dressed in Gold call upon the Unown similar to Arceus. You can not deny Arceus is the God pokemon, he's referenced in Hoopa movie as a Godly figure, he brings wrath upon humanity similar to God in the Bible, in the manga and movie. He is designed after biblical deities and another thing that makes him GOD, is the fact his arms are the unown and unown are reality itself, we know this because Dialga and Palkias dimensions are made up of them. And how they manipulate reality when revealed in the Spell Of Unown movie, this goes with the Christian God being referred to being all there is and is everything as Arceus is the controlling avatar of God, similar to that of Jesus.