The Pokémon Trainer Club is now called the Pokémon Trainer Central and has been updated to be easier to use.

Pokémon Trainer Club Is Now Pokémon Trainer Central

Keep your Pokémon world connected by signing up for a Pokémon Trainer Central account.

Pokémon Trainer Club has gotten a new look and a new name—Pokémon Trainer Central. When you create a Pokémon Trainer Central account, you connect with the Pokémon universe. Whether you're getting the latest news, competing in live competitions, or playing the latest apps, your Pokémon Trainer Central account has you covered.

This account can be used in Pokémon GO, Pokémon UNITE, Pokémon Trading Card Game Live, and more. You’ll also use it when joining the Play! Pokémon community, where it will keep track of your Play! Points and Championship Points.

The new Pokémon Trainer Central is easier to navigate, with simpler parental controls and enhanced security. You can even log in and create an account with your existing Google or Apple credentials. Stay connected to the world of Pokémon with Pokémon Trainer Central!

Source: https://www.pokemon.com/us/pokemon-news/pokemon-trainer-club-is-now-pokemon-trainer-central