It was a dark night on top of the spear pillar in the Sinnoh region. But there was a shadow of Arceus there, a bunch of strong legends tried to fight it but they were overpowered, it even managed to beat Pokemon such as Giratina, Palkia, Dialga and Mega Rayquaza.

Giratina: “Dammit! This thing is to strong how is that possible!?”

Palkia: “My spacial rend move is completely useless to it!”

Dialga: “Roar of time won’t work either!”

Rayquaza: “I-it even beat me in my mega form…”

Hoopa: “Hoopa think this thing is to strong!”

Mewtwo: “D-dammit.. I’m supposed to be the strongest!”

Most legends are already weakend then the shadow of Arceus starts to use its powers summoning more legends only to beat them

Shadow Arceus: “Hahah. None of you fools are a match for my great power!”

Necrozma: “I-it even beat me in my ultra form!?”

Darkrai: “W-we can’t give up..”