“Pokémon” is leveling up its trading card game with a brand new app, and it’s looking to get in on the mobile craze that has made “Pokémon Go,” “Marvel Snap” and other collect-athon games so popular.

There will soon be a new way to collect Pokémon cards and battle fellow trainers. “Pokémon Trading Card Game Pocket,” a brand new app game that innovates the traditional, physical card-collecting, ...