First off, we have Silvally, the evolved form of the mysterious Type: Null.
Type: Null apparently evolves by breaking apart the restraining device on its head and releasing its true strength, but only for a trainer that it trusts. Similar to Arceus's unique ability and signature move, Silvally comes with a signature ability called "RKS System" that changes Silvally's typing depending on the item given to it and a unique move called "Multi-Attack" whose type also changes to match Silvally's held item. These similarities will probably help serve as more fuel for the theory already held by some fans that Type: Null was some sort of experiment to artificially construct Arceus. But alas, the truth has yet to be seen.
Next up we have Jangmo-o's evolutions, Hakamo-o and Kommo-o.
The trailer also showed off the the evolutionary line of Bounsweet:
Steenee (the former) and Tsareena (the latter) both retain Bounsweet's Grass-typing and Tsareena may also come with the new ability Queenly Majesty, which prevents Tsareena's opponents from using priority moves.
Players will also be able to encounter Ribombee, the evolved form of Cutiefly, both Bug and Fairy-type Pokemon.
The trailer then unveiled two more Alolan-form Pokemon: Grimer and Muk.
The game's official website states that "when the population of the Alola region increased, dealing with their garbage became a serious problem. As a solution, Grimer were imported from other regions. They fed primarily on garbage, so their body composition changed—as did their form. What appear to be teeth in this Pokémon’s mouth are in fact residual toxins from the garbage it eats, which have hardened and crystallized." On top of gaining a new appearance, Alolan Grimer and Alolan Muk also gain the Dark-type in addition to their normal Poison-type. This extra type will grant the pair immunity to the Psychic-type attacks that they were previously weak to.
Finally, the new trailer introduced us to Olivia, a Rock-type specialist and the Kahuna of Akala Island, and Ilima, a trial captain who specializes in Normal-types.
You can view the entire trailer here. Pokemon Sun and Moon versions are set for release on November 18, 2016.