List of Pokémon forms by release date/2016

July
Main release of Kanto-region with the game launch. Kanto-region Pokédex introduced 151 new Pokémon species and distinct forms. Kanto Bronze, Silver and Gold  medals became achievable for the first time.

November
Ditto was released disguised as other Pokémon

December
Release of Johto-region Baby Pokémon. Johto-region Pokédex introduced 100 new Pokémon species and 127 distinct forms. Johto Bronze medal became achievable for the first time.