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 winter 2023. Pokémon TCG and video game players and Professors are encouraged to familiarize themselves with the latest rules and regulations ahead of their next competition.
The breakdown of changes, revamps and tweaks is quite extensive. If you want to dig through everything that’s been reworked for Winter 2023, you can find the complete rundown here.