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There's a new type called the Divine type.
Divine is super-effective against Dark, Fighting, and Ghost and weak to Normal, Poison and Psychic.
All the previous Dragon type legendaries except Rayquaza and the Latis have their Dragon type replaced with Divine (Rayquaza becomes Divine/Dragon), and Arceus's default type becomes Divine as well. There's a new plate for Normal type called the Mortal's Plate.
The following Pokémon also become Divine: Espeon (with Sylveon replacing it as the Psychic Eeveelution), Xatu and Togekiss (Divine/Flying), Unown (Divine/Psychic, also Unown gets a new ability that boosts its power depending on how many Unown you own), Jirachi (also Divine/Psychic), Cresselia (pure Divine). Absol gets an evolution that is Dark/Divine.
Doom Desire, Wish, Healing Wish, and Judgment are changed to Divine type moves.
One of the new Pokémon is a pure Divine type, it looks like a bearded head with legs and arms. According to the Pokédex it goes around preaching a message of peace to other Pokémon, and it has a move called Preach a that lowers the target's resistance to Divine attacks. It evolves into a Fighting/Divine Pokémon that looks like a humanoid with a beard that covers it's entire body, and holds a stone tablet.