He fainted for our sins.
The news travels. It goes fast and far in an instant. Many pokemon wouldn't believe Arceus's fall. For a psychic type to do an act of such foolishness. It is unheard of. Somewhere, far away, in the Viridian forest, a tiny Weedle saw the news. Its small heart crumbled to dust. Anger and hatred filled the empty space. It grew up determined to avenge his god. His savior. He never told anyone, but once god smiled to him. He had just hatched and a horde of Pidgey had surrounded him. His parents had abandoned him, so there was nobody there to protect him. It would be a short life, but Arceus descended from the skies and the Pidgey ran away trembling in fear. It was the first time a pokemon didn't care about his "different colour" and cared about him. Weedle didn't forget. Now a powerful Beedrill, soon to get his mega diploma, is standing in front of the Espurr ready to serve justice.
Espurr was paralyzed. It could do nothing but watch as Beedrill closed the distance between them. Normally it would attempt a psychic attack, but now it couldn't move. Something about that look Beedrill gave it, something about those lances he had for arms made Espurr's body stop. Beedrill was already in front of him. Espurr took a glimpse of the giant infuriated hornet. It could swear it saw fire coming out of those blood-red eyes. Beedrill raised his lance. "Forgive me, Father", he said, "for I am about to sin".
The strike was swift and super effective. Espurr was laying on the floor covered in blood. He hadn't trained since the Arceus event, so it was certain it couldn't survive the U-turn. It saw his killer vanish into the horizon, as it slowly closed its eyes.