Here's the Psychic Arceus Overview, courtesy by Mr.lol:
Psychic Arceus
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Observe, nonbelievers, at the Creator in His calmest from whose power He obtains from the Mind Plate. In this form, He sacrifices His divine typing to banish the gluttonous Chansey and power hungry Mewtwo to the depths of Cocytus. With the ability to utilize STAB Psyshock, the glutton will be unable to counter the Creator, and will forcibly judged from his sins as the pain Psyshock causes shall strip it from half of its health after Stealth Rock. The clone of the ancient one will find it difficult for itself to harm Him, allowing Arceus ample time to rid the fool from the earth with a dark Payback. Unfortunately, He does have His flaws. The Psychic-typing of the Creator forces Him to cringe at the sight of spectral figures, and the creatures that thrive in darkness. If this was not enough, His typing fails to grant many resists, only giving him the edge when He is fighting fellow telekinetics, or fools blinded by their own valiant desires. Nevertheless, do give Him a try, for the battlefield shall shudder with telekinetic forces that He bears when He arrives.
I editted some prose by his request. Comment away~