How do I evolve my Arceus into dark type?

Question

I caught an Arceus and I don' t know how to evolve it into dark type Arceus

Answer 1

You don't actually evolve Arceus, you just give it the Elemental Plate that corresponds to the typing you want Arceus to become. In this case, you want to give Arceus the Dread Plate.
If you don't know where to get the Dread Plate, look here.

Hope this helps!
Source: Knowledge