What forms do Arceus have?

Arceus doesn't technically have "forms" in the traditional sense, like how some Pokémon change appearance and abilities when they evolve. Instead, Arceus has Plate forms, which are variations of its appearance and abilities based on the specific Plate it holds.

Here's how it works:

* Plates: There are 18 different Plates in the Pokémon world, each representing a different type (Normal, Fire, Water, Grass, Electric, Ice, Fighting, Poison, Ground, Flying, Psychic, Bug, Rock, Ghost, Dragon, Dark, Steel, and Fairy).

* Plate Effects: When Arceus holds a Plate, it gains the corresponding type's abilities, including its type, moves, and even its appearance can subtly change (mostly in its eyes and markings).

So, Arceus doesn't *transform* into a new form, but rather its existing form is modified by the power of the Plate it holds.

Therefore, it's more accurate to say that Arceus has 18 Plate variations rather than "forms".