what are the controls? i can't do anything during battle but draw cards, sort cards and end turn
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I assume you didn't do the tutorial, but I'll do my best to explain.
A card has a berry cost to be played, shown by the bottom left of the card art (above the name, but below the art, then on the left side), it should be obvious, but 1 blue ball means you need 1 blue/oran berry to play it, you drag the berry to one of your 5 slots and then you play the pokecard.