The Pokémon TCG Online is currently available for Android Tablet devices, as well as iPad and desktop PC and Macs. The game was originally designed for a robust (wifi or wired) data connection and has not been optimized for use over a limited mobile data connection.
Space Required: Up to 6 GB
Android OS Revision: 4.0 or higher
Most Android tablets are supported. Due to the large number of Android devices, we cannot guarantee compatibility with any specific device. Kindle Fire tablets are not natively supported through the Google Play store. The game may run on Kindle Fire tablets, but this has not been tested.
I would recommend you to uninstall and reinstall the game, making sure that your devices meet the minimum requirements.
If you continue experiencing issues with the Pokémon TCG Online, please submit a ticket by clicking the link [to the support portal] in my signature, signing in on the top right side of the page, then selecting the relevant category and clicking Contact Us.
Pokémon TCG Online Moderator
Need help from the support team? Visit the support portal and submit a ticket!