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Pokémon TCG Pocket gets trading later this month, but rules will limit what you can swap
Trading will be added to Pokémon TCG Pocket later this month.
Watch on YouTube The Pokémon Company also stated that only certain cards from both the Genetic Apex and Mythical Island booster packs will be available to trade. Lastly, an item will need to be consumed in order to trade, presumably to stop the feature being overused (and surely provides another monetisation opportunity). "We'll continue to monitor player feedback and assess future updates to the trade feature while keeping in mind how to balance both the ease and enjoyability of collecting," The Pokémon Company said.
Or read this on Eurogamer