Is there any way of getting "???" Arceus in Gen 4?

Question

Is there any way of getting the "???" form arceus in the 4th gen games?

Comments

Highly doubtful.

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Not a full answer, but https://bulbapedia.bulbagarden.net/wiki/Arceus_(Pok%C3%A9mon)
I also don't know what would happen if you hack roost onto a flying Arceus.

Answer 1

In the Generation IV games, there is an unused ???-type Arceus, but it cannot be legitimately obtained in the games, as there is no ???-type Plate. Due to how its Ability would automatically turn any Arceus without a Plate into a Normal-type Pokémon in Generation IV, a ???-type Arceus hacked into the game will be treated as Normal-type.

It cannot be obtained without the use of glitches or exploits.

Source