The promo cards in Pokemon Trading Card Game Pocket can be useful in some respects, but they may induce FOMO among players in the long run.

There are over 200 cards available to collect, battle, and build a deck with in Pokémon TCG Pocket. These cards range from gen 1 to gen 8, with a small handful of Pokémon from each generation of Pokémon,

It’s clear that TCG Pocket isn’t intended to be a one-to-one re-creation of the tabletop version. In the analog version of the game, the choice would matter, since separately packaged booster packs contain different combinations of cards. But with TCG Pocket, the developers won’t say if your choice impacts the cards you get.