Answer
Eibar was the opponent when Braithwaite made his debut for Barcelona. The match took place on February 22, 2020, at the Camp Nou, Barcelona's home stadium. Braithwaite came on as a substitute in the 72nd minute, replacing Ansu Fati. The match ended in a 5–0 victory for Barcelona, with Braithwaite scoring the fifth goal in the 85th minute.