Overlord Creator Arceus Updated
Creator Arceus is a Pokémon that can use both P.Atk and Sp.Atk. Because of this, you can chose what you want to build your Pokémon with, and according to what you can also select the proper Personality and Held Item.
Because of his Type and Passive, he will naturally deal alot of damage while being very defensive at the same time.
Because of using both P.Atk and Sp.Atk, you have multiple options for personality. You can even use a Neutral Personality that doesn't increase or reduce stats.
Disclaimer: This is a basic recommended build. Please keep in mind that some builds might need to be changed in order to adapt your pokémon to the current meta, or to simply adapting yourself to the enemies that you play against.