is there any flightless bats

Yes, there are species of bats that exhibit flightlessness, although they are extremely rare. One notable example is the extinct Giant Golden-Crowned Flying Fox (Acerodon jubatus), which was unable to fly due to its size and habitat adaptations. However, most bats are capable of flight, as it is a key characteristic of the order Chiroptera. Flightlessness in bats is not a common evolutionary trait.