The Play! Pokémon rules and regulations are periodically reviewed to maintain competitive balance in the Championship Series. The documents have been updated to reflect the latest review in autumn 2019. Pokémon TCG and video game players and Professors are encouraged to familiarize themselves with the latest rules and regulations ahead of their next competition.
We'll continue to follow the events of the season and review the documents at regular intervals. Check back here at Pokemon.com for notices of when documents have been updated.
Good luck, Trainers!