Really love playing this game.
I'm on my second round and am trying to collect every card (selling extras and the like to help performance) so I would love a pokedex feature to keep track of cards I've seen, owned and currently have.
Something like a blank list which fills up with every new card you face in a battle, have a gray little dot behind it if owned at some point and a red dot if currently owned or similar.
Doing it manually with an outside tool is kind of clunky so a tracker in game would be neat for that goal.