Can't even call this a game, but I'll review its functionality. I like getting to make trades from my phone, that's cool. Checking online battle stats is also nice. That being said, for an app that's sole purpose is to store all your extra Pokemon, this one does a horrible job of letting you organize them. It's actually so bad.
I wish it was at least as cheap as Pokemon Bank, but oh well. Anyways, this service is severally underrated. The trading within the app is so fun and has become my main wonder trading pokemon since the ones in the switch games kinda suck(RIP 3DS wonder trades) And also the challenges that are in the app are awesome! you unlock really cool artworks when you complete them. Artworks by artists from the TCG mainly, Kawayoo for example drew all the ruinous pokemon for one of the challenges, and you can view the artwork in the app once you unlock it, very cool. The Switch app is missing sorting and is also very slow but all is fine. I like home, just expensive.