They actually revealed all but one of the new Pokémon beforehand.
☆ NintendObs Weekly – Monday, December 19, 2016 – Sunday, December 25, 2016.
Alolan Pokémon Join the Pokédex
The online Pokédex has been updated with all the newly discovered Pokémon from Pokémon Sun and Pokémon Moon.
December 20, 2016
Check out the amazing Pokémon from the Alola region in the online Pokédex here on Pokemon.com. Browse all the Pokémon that you can now discover in the Pokémon Sun and Pokémon Moon games, or filter your results by type, size, and other criteria. The Pokédex can help you prepare for your next battle by looking up each Pokémon’s Ability and type weakness.
Take a look at all the awesome Alola region Pokémon in the Pokemon.com Pokédex.
— Pokémon News
Source: Pokémon.
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