Niantic has announced that to celebrate the Pokémon Trading Card Games 25th anniversary, Professor Willow will appear as a Pokémon TCG card in the summer of 2021.

A collaboration has been finalized between Pokémon GO and the Pokémon Trading Card Game!

Trainers, A collaboration has been finalized between Pokémon GO and the Pokémon Trading Card Game!

2021 marks the 25th anniversary of the release of Pokémon Red and Pokémon Green. And, just like the video games, the Pokémon Trading Card Game is also celebrating its 25th anniversary. To celebrate, we are doing a collaboration between Pokémon GO and the Pokémon Trading Card Game!

In part 1 of the collaboration, Professor Willow will appear as a Pokémon TCG card in summer 2021, which marks the five-year anniversary of the release of Pokémon GO! We plan for this card to be obtainable in regions around the world where the Pokémon TCG is sold.

Starting in late May 2021, we plan to announce the art and content of the Professor Willow card and details on how to get the card in each area. We will make announcements as further collaborations are determined, so we hope you will look forward to those!

The Pokémon Trading Card Game is a two-player, head-to-head trading card game based on the Pokémon video game series. You can experience the fun of collecting Pokémon TCG cards, building your own deck, and using it in Pokémon battles.

Source: https://pokemongolive.com/post/pcg-professor-willow