With Alola coming, here are the remaining unreleased Pokémon from Gen 3 through Gen 6, including unreleased Galarian Forms : r/TheSilphRoad

Pokemon: Every Regional Form (All Alolan, Galarian, Hisuian & Paldean Pokemon)

With Pokémon from Paldea coming soon to the game, here is every Pokémon and forms that are missing from Pokémon GO. (Megas and Gigantamax not included) : r/TheSilphRoad

Pokémon Go Gen 7 Pokémon list released so far, and every creature from Sun and Moon's Alola region listed

Where do I catch a Porygon in Pokémon GO? - Quora

So there are new forms (this is to fill space) : r/PokeLeaks

Obscure Pokémon Fact Day 131: Four in One : r/pokemon

Pokémon Go gets new Galarian Pokémon forms with Throwback Challenge - Polygon

What is the rarest item in Pokemon Go? - Quora

Ultra Unlock Part 3: Galar Overview (Via LegendsLima) : r/TheSilphRoad

Pokemon GO: Hard to believe niantic would present this information in a opaque and confusing way - The Something Awful Forums

Pokemon coming to Scarlet and violet : r/PokemonScarletViolet