The Alola Seasons have just started this March 1st on Pokémon GO. The opportunity for you to capture a multitude of new creatures straight from the Generation 7. As with every release of a new generation on the mobile game, only a few of the Pokémon are available and here is the list. The others will be added gradually throughout the year. Note that some forms of Alola like Noadkoko have already been present for a few months already.
List of added 7G Pokémon
A special Alola event has started that allows you to capture some Pokémon from the region.