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>pokemon trainers receive a device that looks like a phone and is imbued with particular chip and acts as a reader for special cards that can induce special effects towards pokemon
>card effects vary from enhancing stats to modifying abilities, field-effect and even temporary changing the pokemon type. there are also rare cards with even greater effects that can give special forms to specific pokemon
>card effects are only possible because of the special waves of the region and the chip that is capable of synchronizing them towards the pokemon of the trainer. because of this, there are many different cards made by different people, but the rarest and stronger ones are usually made by gurus.
>during official battles, players are allowed to use only THREE cards that must be selected beforehand. the effects activate right before the attack, and they can be used together with items. there are also special cards that can only be used outside battles.