List of Pokémon forms by release date

This list includes: This list doesn't include:
 * New Pokémon species released either by Research tasks, egg hatching, evolving, catching wild Pokémon, or Raid Battle Bonus Challenge.
 * New distinct regular Pokémon forms released. For reference go to List of Pokémon with different forms.
 * New shiny forms released. For reference go to Shiny Pokémon and List of Shiny Pokémon.
 * Pokémon gender differences. Both genders are made available when the Pokémon form is released. For reference go to List of Pokémon gender differences.
 * Pokémon wearing event-themed pieces of clothes. For reference go to Events.

The total number of Pokémon species and Pokémon distinct forms (regular and shiny) was updated according to the following events:
 * Kanto-region Pokédex introduced 151 new Pokémon species and distinct forms. Total count started with 151 Pokémon species and Pokémon distinct forms.
 * Johto-region Pokédex introduced 100 new Pokémon species and 127 distinct forms. Total count updated to 251 Pokémon species and 278 Pokémon distinct forms.
 * Hoenn-region Pokédex introduced 135 new Pokémon species, 148 distinct regular forms and 145 distinct shiny forms. Total count updated to 386 Pokémon species, 426 distinct regular forms and 423 distinct shiny forms.
 * The difference between distinct regular and shiny forms numbers occurred due to 3 Castform non-normal forms that do not have shiny variants.
 * Alolan-region forms became available rising up Kanto-region Pokédex to 169 distinct forms. Total count updated to 444 Pokémon distinct regular forms and 441 distinct shiny forms.
 * Sinnoh-region Pokédex introduced 107 new Pokémon species and 121 distinct forms. Total count updated to 493 Pokémon species, 565 distinct regular forms and 562 distinct shiny forms.
 * Unknown-region Pokédex became available for Meltan and Melmetal. Total count updated to 495 Pokémon species, 567 Pokémon distinct regular forms and 564 distinct shiny forms.
 * Visit the following pages for detailed release information: