This page is the list of all Pokémon forms available in the game to be obtained in 2017 for the first time, ordered by release date, with counters for each region Pokédex.
Main release of Johto-region. 84 Pokémon species including 26 forms of Unown were released, one for each letter of the alphabet. Johto Silver and Gold medals became achievable for the first time.
Raikou, Entei and Suicune were released as Raid Bosses. They were exclusive to following regions in the first month: Raikou could be battled throughout the Americas. Entei could be battled throughout Europe and Africa. Suicune could be battled throughout the Asia-Pacific region.
Release of Hoenn-region Halloween-themed Pokémon at the start of Halloween 2017. Shiny Sableye was released. Hoenn-region Pokédex introduced 135 new Pokémon species, 148 distinct regular forms and 145 distinct shiny forms. Hoenn Bronze medal became achievable for the first time.