The Space-Time Smackdown expansion will focus on the Sinnoh region and will feature Dialga and Palkia as the figurehead Pokémon for the two new packs. The expansion also introduces Tool-type cards that will provide your Pokémon with even more support in battle.

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.