There are only two versions of the Pocket. One has CC2500 and the other is ELRS. Neither of them is compatible with FlySky receivers. You need a 4in1 module for that. You can get an external 4in1 module that fits the Pocket, but it costs $60, so probably not what you’re looking for. That said, a Pocket ELRS with the external 4in1 sounds like a pretty versatile radio.