Golbat are notably more dangerous than their pre-evolution, in that the qualities that made Zubat harmless are no longer present. Its fangs are long enough to break human skin, and it is reported having no problem whatsoever using its own body as bait for a meal.
Fortunately, we have the exact same idea.
Our researchers came prepared with several sterilized bags filled with imitation blood, attached to tubes that mimicked veins along their shoulders and necks. Rather than taking the risk of being bitten, once the actual specimen research began, Golbat quickly found their easier, tastier targets, and allowed our researchers to gather information all they liked. They seemed partial towards male researchers, but that may be because they're used to males being the more aggressive side of mating. Once female researchers took their time and showed their interest, oh so easily falling into their trap, it wasn't difficult to gather information from both perspectives. As for any breeders or trainers, be very well prepared to make a sacrifice of blood if you don't have the equipment, in order to mate with your Golbat. Even when examining Golbat mate with each other, the habit is still there consistently, biting into their mates even without the intention of feeding. Otherwise, Golbat are amazingly submissive to other species, letting most creatures do as they like, so long as there's no actual damage done to them, and they get to take a bite themselves. Perhaps this is a subversive survival technique, a sort of "playing dead", letting their bodies be used in exchange for a meal. They certainly seem to enjoy it by any means, and with the proper protection, it may be possible to train the habit of biting out of a domesticated Golbat.