Cheren and Bianca are childhood friends and rivals. They go on separate journeys with Cheren being a trainer and later a gym leader and Bianca assisting Professor Juniper, but they still meet up every now and then (usually along with Hilda and Hilbert).
— In the games —
— Fan art —
My thoughts — Cheren totally gave his glasses to Bianca within the two years between BW and BW2