The Pokémon TCG Live game client is being taken back offline for emergency maintenance to investigate ongoing issues with latency, code redemptions, and matchmaking. Please see the Version 1.25.0 Gameplay Experience Disruptions thread for the latest updates.
Related Announcement: Pokémon TCG Live April Maintenance Issues and Content Schedule Changes.
What happened?

Where are my Mew Ex Versatiles? My Mega Mewtwo EXs? Are they holding them for something else? What happened to the trade market? Why can't I purchase packs via points I get for returning codes? In short, WHAT HAPPENED TO PTCGO!?
Answers
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In 2023 PTCGO was removed from the App Store, Google Play, and Pokemon.com and game servers were shut down! in PTCG Live cards from the XY Series and the Black & White Series are are not playable yet! and cards from the series before those are gone forever! that's what happened
If you want to view those cards (from XY) you have to go into deck editor and on the filters show all cards, make sure you don't select Standard format deck
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aww dang, i hope my old content didn't get fully erased….. i had alot of special cards that i was really proud of…..
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