It's decent for a bit of fun every day for gamers who like the collection mechanic. However, a lot depends on whether you play first or second and the initial cards you draw. There should at least be a quick restart option for solo battles. Also, there should be more deck slots since you need decks with only common cards for the solo missions, and it's quite frustrating to build these continuously for every solo battle. The trading system should also be more flexible.

There is also some game behavior that can be optimized. The turn should end when the defending Pokemon is killed and the game should end when a player loses. Some actions like rolling a coin happen even when the outcome is no longer relevant.