Linking an Additional Login Provider to your Account — Pokémon GO Help Center

After creating your Pokémon GO account, you may link an additional login provider—either Pokémon Trainer Club, Facebook, Google, or Apple—to

Niantic Terms of Service – Niantic Labs

How to Connect to Pokémon GO — Pokémon Scarlet and Pokémon Violet

Pokémon GO Plus + official website

Sending Pokémon to Pokémon HOME — Pokémon GO Help Center

Connect Pokémon GO to Pokémon HOME for a Melmetal That Can Gigantamax

Pokemon Go Can't Log in with Facebook: How to Fix It?

Everything to know about Pokémon GO Tour Hoenn : NPR

My progress was reset to level 1 — Pokémon GO Help Center

Niantic Support

How to log in if Pokemon Go Trainer Club is down - Dexerto

How to log in if Pokemon Go Trainer Club is down - Dexerto

PTC Players: Fix/work-around for Unable to link this account when adding Google : r/TheSilphRoad

Linking your Pokémon GO account: how to play when PTC goes down

Playing with Pokémon GO｜Pokémon GO Plus + official website