Every bishop is a pontiff. Every diocese is a Church, called a local Church, which forms part of a larger Church. Twenty-three Churches form the universal Catholic Church. The Roman Catholic Church is the biggest of the 23, but not the only one. It is often referred to as the Latin Church, the Church of Rome or the Mother of all Churches. There is a problem with how these titles are understood today, but that’s better in the Eastern Catholic forum.
In any case, it’s not a matter of infallibility, it’s a matter of apostolic collegiality. The apostles themselves set the example by invoking the Council of Jerusalem, which we can read about in Acts. They understood that Peter could not rule alone. He was the bridge builder between pontiffs, hence the term “Supreme Pontiff”. He is the pontiff above all other pontiffs. But they are pontiffs nonetheless.
Each Church is autonomous. The pope cannot ride roughshod over them. This would be a violation of justice. Peter and his early successors did dictate to the other Churches without their (name removed by moderator)ut. Paul got a hearing that the Council of Jerusalem. Had Paul not gotten a hearing, every Gentile would have had to be circumcised and submitted to the Jewish laws that prepared for the coming Messiah. Those laws were no longer needed, as the Messiah had come. But were it not for a council, we would have been bound by Peter’s decision to require that every convert to Christianity embrace everything in Judaism.
The apostles understood the need for coordination, dialogue and feedback to Peter. Together, with Peter, they carryout the first council, the Council of Jerusalem.