Knowing that the changes in the eastern continent has been great, Adrian did not want to stay too long. He immediately went straight towards Vermillion City after passing through the town where he gathered information. Apparently, the people who revived the Goddess Izanami is also spreading like wildfire which is why there are no people that travel that much. The protectors of the east were also sealed in their mountain by the Goddess Izanami herself.
The reason why Peridot was reluctant to say things about the state of her master is that she was sealed along with the other eastern dragons. They were all sealed when they were in their hibernating state and the gatekeepers were even severely injured or killed trying to stop the Goddess Izanami. The descent of the Goddess Izanami meant that she must have broken the shackle of power in the eastern continent and has the power of a high goddess.