You might be referring to the end of the age of warring states, when Tokugawa Ieyasu 'unified' Japan. This was in the early 17th century.
An example of a daimyo is a person who owned a large piece of land in Japan.
it didn't help with anything
It is Daimyo
NO
they unify by means of flying
Oda Nobunaga was a daimyo of Japan
Daimyo
The daimyo help weaken the shogun by fighting to break free the shogun's control.
Oda Nobunaga was a daimyo. He was one of many daimyo who wanted to get enough power then rule Japan. He defeated all those who were competing against his for the power, and he seized Kyoto the capital in 1568. His motto was "rule the empire by force." He wanted to destroy all his enemies and all his rivals. He was harsh with his rule and so he could not unify Japan. In 1582, he committed seppuku because his one of his own general's turned against him.
In the late 1500's Samurai worked to unify Japan.
The shogun was the main "advisor" of the emperor. In truth the shogun had all of the control, as the emperor was just a figurehead. The daimyo were provincial rulers who had control over small amounts of territory and at different times had largely independent power.