Of all the new cards being added to Pokemon TCG Pocket with the upcoming Space-Time Smackdown set, one has the potential to be a meta game-changer.

Pokemon TCG Pocket is a free-to-play mobile version of the popular card-collecting phenomenon, allowing players to open two packs daily for free. Of course, you can head into the shop and spend real-world money to open as many cards as you want,

This means that players actually won't be able to trade cards from the Space-Time Smackdown expansion when it launches, and will instead have to wait for that option. It also means that all the Pokemon TCG Pocket rarest cards can't be traded, so if you wanted somebody's gold Mewtwo ex, you won't get it.