1. You have selected an Active Pokemon, the game requires you to press Done. You can only have 1 active pokemon. You don't have a choice. -> Automatically press Done after I have selected and dragged an Active Pokemon to that spot.
2. If you have no pokemon to set up after the Active Pokemon, the game requires me to press Done. If you don't have them in your hand, the game can easily know this, that you don't have a choice.-> Do that automatically.
3. In a tournament, if you lose in the 1st round, you have to stay around till round 3 to get any prizes. Why? Let players leave and give them their rewards based on their rank which is known in single elimination.
There are probably more basis UX usability things the Pokemon Online TCG developer team can improve like the coin flip, but these are the first that come to mind. If you have additional moments like these, feel free to add them to this thread!