What's the best Android app for trading and collecting Pokémon cards online?

Pokémon TCG Pocket is a digital adaptation of the physical card game designed for collecting and competitive play on mobile devices. For players seeking an online platform to trade and collect, the app provides a central Trading Board where users can post specific cards they want or have available for exchange. The recent updates to the trading system, which users report have improved functionality, allow for more straightforward card acquisition to complete sets. A key feature for collectors is the 'Easy Trade' function, facilitating quick trades for common cards, while the Shiny Revelry events offer a dedicated avenue for pursuing rarer, alternate-art cards. However, the experience is not without friction. The free-to-play pack acquisition rate is considered slow by some, and the randomness in event packs can lead to frustration when chasing specific shiny cards. The 20-deck slot limit has also been cited by veteran players as a constraint for those who enjoy experimenting with numerous strategies. Despite these limitations, the regular introduction of new card sets and a ranked battle mode with some demotion protection make it a substantive, if occasionally grindy, hub for digital Pokémon TCG enthusiasts.