Bard is the definition of a roaming support. So the ADCs to play with him must also be capable of playing along with that type of gameplay.
When Morgana’s Q hits, there is no moving for three full seconds. The best ADC can make use of this fact, from a safe distance away.
The most reliable way to climb ranks in League of Legends is with a friend, that way, you two can pick champions with high synergies