What is Pokémon GO Great League Challenge for Pokémon GO?

You can battle your opponents within Pokémon GO in am open Great League format.

What do you need for Pokémon GO - Great League Challenge?

Bring your phone, perhaps a charger and your Pokémon to battle with.
You will also need a Trainer ID, obtainable through www.pokemon.com but can be provided if needed.
Additional a team list need to be filled in: Team List 

What can get?

Entry is free. By participating you get 1 prize pack TCG booster.