Due to its low print run, the set is considered the pinnacle of Pokmon box collecting
it has its value, but its sadly not a cat
You can choose to have multiple copies of the same card if you like, but they will count towards the total limited number Example: If you use 3 copies of D.D
One very special Collector booster is going to have a one-off, unique version of the card, complete with a serial number of 1/1
At the time of this writing, there's no penalty for losing a Pokmon TCG Pocket battle, so when placing a little Ratatta against a Mewtwo ex deck, it's best to use the handy "concede" button
Note that not targeting means this gets around effects like Leyline of Sanctity