History of Oceania

Was Pangaea the only time all of continents have been together?

No, Pangaea was not the only time all of the continents have been together. Before Pangaea, there was another supercontinent called Rodinia, which existed from about 1.1 billion years ago to 750 million years ago. Rodinia was formed when most of the Earth's landmasses came together into a single, giant continent. After Rodinia broke apart, the continents eventually came together again to form Pangaea about 335 million years ago. Pangaea then began to break apart about 200 million years ago, and the continents have been drifting apart ever since.