Pokémon TCG Pocket has a lot of cards to begin with, but there are even rarer ones to find when you start looking away from packs, with special Promo cards on offer outside of the base expansion sets.
These are known as Promo-A cards and are likely the first in a long line of exclusive alternative artwork cards that trainers can try to find and add to their collections. In truth, it’s unlikely you’ll be able to get every one of them by yourself, and you might need to use the future trading feature to get some of the rarer cards. Some cards in the set are also still unavailable but are likely to drop in time.