Yes, provided he is in communion with the Pope.
But let me elaborate. The Magisterium is not on any particular schedule, similar to, say, the Congress. They communicate as necessary and meet as necessary. There are really two aspects to the Magisterium: Sacred and Ordinary. I was describing the Ordinary Magisterium, which guides the Church at all times. It is to be obeyed but it may reverse itself. The teachings of Sacred Magisterium are given on a solemn occasion and are infallible dogma. They are proclaimed at councils. In principle, the Pope can originate sacred magisterial teaching alone (papal infallibility) but is has not been exercised this way in recent (past thousand years or so) history.
See Magisterium