playing card collection display case Collectible while the inside dimensions measure 33w x 36 1/2h x 1 1/2 deep Wall Display for Playing Card

There are usually 5 possible cards you can get in a promo pack, so keep doing the battle challenges until you unlock them all

These certainly have their uses, but I found the "overwhelm an opponent with hyena cards" strategy to be pretty useful (and fun)

On the upper left corner of the cards page, you will see a button that shows a preview of the flairs you own for that specific card and how many of each you have, but you cannot apply them through this function in Pokmon TCG Pocket

Source(s) Image source: Pokmon Company

If I wanted to kill a specific card type, I would just select the exact answer for it, but I want to catch them all with a single card