When the world of the Ninja Realm fused with the world of Pokemon, the League, knowing nothing about the ninjas who had come from the Ninja Realm, launched an attack on them.
The power of Pokemon clashed with the ninjas' chakra. Only one person, Uchiha Izuna, became the catalyst for the two worlds to fuse and develop together.
(Just a fantasy the author had before their OPPO A5 and Switch exploded.)